8WRZ | pdb_00008wrz

Cry-EM structure of cannabinoid receptor-beta-arrestin-1 complex

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations
Membrane Protein Annotation: PDBTM
Membrane Protein Annotation: MemProtMD
Protein Modification Annotation

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
C [auth R]	SCOP2B Superfamily	G protein-coupled receptor-like	8091168	3000473	SCOP2B (2022-06-29)
C [auth R]	SCOP2B Superfamily	G protein-coupled receptor-like	8091168	3000473	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
C [auth R]	PD40	e8wrzR01	A: alpha bundles	X: Helical bundle insertion in helicase domains	H: Helical bundle in Hef helicase	T: Helical bundle in Hef helicase	F: PD40	ECOD (develop294)
B [auth L]	PD40	e8wrzL01	A: alpha bundles	X: Helical bundle insertion in helicase domains	H: Helical bundle in Hef helicase	T: Helical bundle in Hef helicase	F: PD40	ECOD (develop294)
A	PD40	e8wrzA01	A: alpha bundles	X: Helical bundle insertion in helicase domains	H: Helical bundle in Hef helicase	T: Helical bundle in Hef helicase	F: PD40	ECOD (develop294)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth L]	Light Chain	IGKV1	Kappa	beta-arrestin-1 \| vasopressin v2 receptor	SAbDab (2026-03-20)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C [auth R]	PF00001	7 transmembrane receptor (rhodopsin family) (7tm_1)	7 transmembrane receptor (rhodopsin family)	This family contains, amongst other G-protein-coupled receptors (GCPRs), members of the opsin family, which have been considered to be typical members of the rhodopsin superfamily. They share several motifs, mainly the seven transmembrane helices, GC ...	This family contains, amongst other G-protein-coupled receptors (GCPRs), members of the opsin family, which have been considered to be typical members of the rhodopsin superfamily. They share several motifs, mainly the seven transmembrane helices, GCPRs of the rhodopsin superfamily. All opsins bind a chromophore, such as 11-cis-retinal. The function of most opsins other than the photoisomerases is split into two steps: light absorption and G-protein activation. Photoisomerases, on the other hand, are not coupled to G-proteins - they are thought to generate and supply the chromophore that is used by visual opsins [1].	Domain
A	PF00339	Arrestin (or S-antigen), N-terminal domain (Arrestin_N)	Arrestin (or S-antigen), N-terminal domain	Ig-like beta-sandwich fold. Scop reports duplication with C-terminal domain.	Domain
A	PF02752	Arrestin (or S-antigen), C-terminal domain (Arrestin_C)	Arrestin (or S-antigen), C-terminal domain	Ig-like beta-sandwich fold. Scop reports duplication with N-terminal domain.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
D [auth V]	Vasopressin V2 receptor	vasopressin receptor activity peptide receptor activity molecular transducer activity G protein-coupled receptor activity G protein-coupled peptide receptor activity signaling receptor activity transmembrane signaling receptor activity	regulation of body fluid levels hemostasis biological regulation regulation of biological quality regulation of tube diameter multicellular organismal process regulation of biological process system process regulation of tube size regulation of system process positive regulation of biological process positive regulation of vasoconstriction circulatory system process regulation of blood circulation regulation of body fluid levels hemostasis biological regulation regulation of biological quality regulation of tube diameter multicellular organismal process regulation of biological process system process regulation of tube size regulation of system process positive regulation of biological process positive regulation of vasoconstriction circulatory system process regulation of blood circulation vascular process in circulatory system regulation of vasoconstriction positive regulation of multicellular organismal process regulation of multicellular organismal process blood vessel diameter maintenance vasoconstriction blood circulation regulation of anatomical structure size renal system process transport homeostatic process fluid transport establishment of localization water transport renal water transport localization multicellular organismal-level homeostasis chemical homeostasis renal absorption multicellular organismal-level water homeostasis multicellular organismal-level chemical homeostasis renal water absorption renal water homeostasis regulation of biosynthetic process regulation of cellular process regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process positive regulation of macromolecule biosynthetic process regulation of gene expression positive regulation of metabolic process biosynthetic process positive regulation of gene expression positive regulation of biosynthetic process regulation of macromolecule biosynthetic process metabolic process cellular process positive regulation of macromolecule metabolic process macromolecule metabolic process regulation of metabolic process positive regulation of cellular process cellular response to stimulus response to stimulus signaling cell communication adenylate cyclase-modulating G protein-coupled receptor signaling pathway G protein-coupled receptor signaling pathway signal transduction cellular response to endogenous stimulus cellular response to chemical stimulus response to hormone response to endogenous stimulus response to chemical cellular response to hormone stimulus response to peptide response to cytokine regulation of systemic arterial blood pressure by hormone regulation of systemic arterial blood pressure mediated by a chemical signal regulation of blood pressure regulation of systemic arterial blood pressure endocrine process regulation of systemic arterial blood pressure by vasopressin adenylate cyclase-activating G protein-coupled receptor signaling pathway cell population proliferation positive regulation of cell population proliferation regulation of cell population proliferation positive regulation of cell communication regulation of signaling positive regulation of signal transduction positive regulation of intracellular signal transduction regulation of signal transduction intracellular signal transduction positive regulation of response to stimulus regulation of intracellular signal transduction regulation of response to stimulus regulation of cell communication positive regulation of signaling regulation of urine volume renal water retention negative regulation of urine volume developmental process head development forebrain development animal organ development brain development nervous system development multicellular organism development central nervous system development anatomical structure development telencephalon development system development negative regulation of cell population proliferation negative regulation of cellular process negative regulation of biological process positive regulation of adenylate cyclase activity positive regulation of molecular function regulation of molecular function positive regulation of cyclase activity activation of adenylate cyclase activity regulation of adenylate cyclase activity regulation of catalytic activity positive regulation of catalytic activity positive regulation of lyase activity positive regulation of systemic arterial blood pressure positive regulation of blood pressure	cellular anatomical structure membrane membrane-bounded organelle intracellular anatomical structure intracellular vesicle intracellular organelle bounding membrane of organelle cytoplasmic vesicle vesicle membrane clathrin-coated vesicle endocytic vesicle membrane coated vesicle vesicle endocytic vesicle cellular anatomical structure membrane membrane-bounded organelle intracellular anatomical structure intracellular vesicle intracellular organelle bounding membrane of organelle cytoplasmic vesicle vesicle membrane clathrin-coated vesicle endocytic vesicle membrane coated vesicle vesicle endocytic vesicle clathrin-coated vesicle membrane clathrin-coated endocytic vesicle membrane intracellular membrane-bounded organelle clathrin-coated endocytic vesicle cytoplasmic vesicle membrane coated vesicle membrane organelle cytoplasm organelle membrane cell periphery plasma membrane Golgi apparatus endomembrane system endosome perinuclear region of cytoplasm endoplasmic reticulum
C [auth R]	Soluble cytochrome b562,Cannabinoid receptor 1	binding tetrapyrrole binding heme binding electron transfer activity cation binding transition metal ion binding iron ion binding ion binding metal ion binding small molecule binding cannabinoid receptor activity molecular transducer activity G protein-coupled receptor activity transmembrane signaling receptor activity binding tetrapyrrole binding heme binding electron transfer activity cation binding transition metal ion binding iron ion binding ion binding metal ion binding small molecule binding cannabinoid receptor activity molecular transducer activity G protein-coupled receptor activity transmembrane signaling receptor activity signaling receptor activity identical protein binding protein binding	electron transport chain metabolic process cellular process generation of precursor metabolites and energy cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus signaling biological regulation adenylate cyclase-activating G protein-coupled receptor signaling pathway cell communication adenylate cyclase-modulating G protein-coupled receptor signaling pathway G protein-coupled receptor signaling pathway electron transport chain metabolic process cellular process generation of precursor metabolites and energy cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus signaling biological regulation adenylate cyclase-activating G protein-coupled receptor signaling pathway cell communication adenylate cyclase-modulating G protein-coupled receptor signaling pathway G protein-coupled receptor signaling pathway signal transduction cannabinoid signaling pathway trans-synaptic signaling trans-synaptic signaling by endocannabinoid retrograde trans-synaptic signaling cell-cell signaling retrograde trans-synaptic signaling by endocannabinoid synaptic signaling trans-synaptic signaling by lipid retrograde trans-synaptic signaling by lipid multicellular organismal process neuron recognition cellular developmental process cell projection organization cell development neuron projection development neuron projection fasciculation cellular component organization neurogenesis multicellular organism development neuron differentiation axonal fasciculation cell differentiation anatomical structure development cell recognition cellular component organization or biogenesis system development developmental process plasma membrane bounded cell projection organization nervous system development axon development generation of neurons neuron development inorganic ion homeostasis intracellular calcium ion homeostasis homeostatic process calcium ion homeostasis regulation of cytosolic calcium ion concentration regulation of presynaptic cytosolic calcium ion concentration cellular homeostasis neuron cellular homeostasis chemical homeostasis intracellular monoatomic cation homeostasis monoatomic ion homeostasis intracellular chemical homeostasis monoatomic cation homeostasis intracellular monoatomic ion homeostasis glucose homeostasis carbohydrate homeostasis G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger	cellular anatomical structure periplasmic space intracellular organelle intracellular anatomical structure cytoskeleton organelle membraneless organelle intracellular membraneless organelle actin cytoskeleton membrane-bounded organelle mitochondrial membrane mitochondrion membrane organelle outer membrane cellular anatomical structure periplasmic space intracellular organelle intracellular anatomical structure cytoskeleton organelle membraneless organelle intracellular membraneless organelle actin cytoskeleton membrane-bounded organelle mitochondrial membrane mitochondrion membrane organelle outer membrane intracellular membrane-bounded organelle organelle envelope bounding membrane of organelle mitochondrial envelope mitochondrial outer membrane outer membrane cytoplasm organelle membrane cell periphery plasma membrane presynapse synapse cell junction presynaptic membrane plasma membrane region synaptic membrane membrane microdomain membrane raft growth cone axon cell projection distal axon neuron projection plasma membrane bounded cell projection site of polarized growth GABA-ergic synapse glutamatergic synapse
B [auth L]	scfv30 light chain, scfv30 heavy chain	-	-	-
A	Beta-arrestin-1	protein binding binding arrestin family protein binding GTPase regulator activity enzyme regulator activity enzyme activator activity GTPase activator activity molecular function activator activity nucleoside-triphosphatase regulator activity molecular function regulator activity angiotensin receptor binding signaling receptor binding G protein-coupled receptor binding molecular adaptor activity protein binding binding arrestin family protein binding GTPase regulator activity enzyme regulator activity enzyme activator activity GTPase activator activity molecular function activator activity nucleoside-triphosphatase regulator activity molecular function regulator activity angiotensin receptor binding signaling receptor binding G protein-coupled receptor binding molecular adaptor activity ubiquitin protein ligase binding ubiquitin-like protein ligase binding enzyme binding insulin-like growth factor receptor binding molecular function inhibitor activity enzyme inhibitor activity transcription coactivator activity transcription regulator activity transcription coregulator activity protein-macromolecule adaptor activity	cellular homeostasis chemical homeostasis homeostatic process glucose homeostasis carbohydrate homeostasis intracellular chemical homeostasis intracellular glucose homeostasis interleukin-6 production multicellular organismal process regulation of cellular process negative regulation of biological process regulation of interleukin-6 production regulation of cytokine production cytokine production cellular homeostasis chemical homeostasis homeostatic process glucose homeostasis carbohydrate homeostasis intracellular chemical homeostasis intracellular glucose homeostasis interleukin-6 production multicellular organismal process regulation of cellular process negative regulation of biological process regulation of interleukin-6 production regulation of cytokine production cytokine production negative regulation of cellular process regulation of multicellular organismal process negative regulation of macromolecule metabolic process regulation of biosynthetic process regulation of biological process negative regulation of metabolic process biological regulation negative regulation of cytokine production regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process regulation of gene expression negative regulation of interleukin-6 production negative regulation of gene expression biosynthetic process negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process regulation of macromolecule biosynthetic process metabolic process cellular process macromolecule metabolic process negative regulation of multicellular organismal process regulation of metabolic process negative regulation of post-translational protein modification regulation of protein modification process regulation of protein ubiquitination regulation of primary metabolic process protein ubiquitination negative regulation of protein modification process protein metabolic process negative regulation of protein ubiquitination regulation of protein modification by small protein conjugation or removal protein modification process negative regulation of protein metabolic process negative regulation of protein modification by small protein conjugation or removal regulation of post-translational protein modification regulation of protein metabolic process primary metabolic process macromolecule modification post-translational protein modification protein modification by small protein conjugation protein modification by small protein conjugation or removal actomyosin structure organization actin cytoskeleton organization actin filament organization cellular component organization cellular component biogenesis organelle organization cellular component assembly actin filament bundle organization contractile actin filament bundle assembly actin filament-based process actin filament bundle assembly stress fiber assembly cellular component organization or biogenesis supramolecular fiber organization cytoskeleton organization cellular response to stimulus negative adaptation of signaling pathway response to stimulus negative regulation of signaling signaling desensitization of G protein-coupled receptor signaling pathway regulation of signal transduction negative regulation of G protein-coupled receptor signaling pathway negative regulation of cell communication cell communication signal transduction regulation of G protein-coupled receptor signaling pathway regulation of signaling negative regulation of response to stimulus negative regulation of signal transduction regulation of response to stimulus adaptation of signaling pathway regulation of cell communication G protein-coupled receptor signaling pathway system process sensory perception nervous system process catabolic process protein catabolic process macromolecule catabolic process modification-dependent macromolecule catabolic process modification-dependent protein catabolic process ubiquitin-dependent protein catabolic process muscle hypertrophy regulation of muscle adaptation positive regulation of cardiac muscle hypertrophy regulation of system process positive regulation of biological process striated muscle hypertrophy regulation of muscle system process muscle system process regulation of cardiac muscle hypertrophy regulation of muscle hypertrophy muscle adaptation positive regulation of muscle hypertrophy cardiac muscle hypertrophy positive regulation of multicellular organismal process negative regulation of interleukin-8 production interleukin-8 production regulation of interleukin-8 production positive regulation of DNA-templated transcription RNA metabolic process positive regulation of macromolecule biosynthetic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process positive regulation of metabolic process DNA-templated transcription regulation of RNA metabolic process transcription by RNA polymerase II positive regulation of biosynthetic process positive regulation of macromolecule metabolic process regulation of nucleobase-containing compound metabolic process positive regulation of cellular process regulation of RNA biosynthetic process regulation of transcription by RNA polymerase II positive regulation of transcription by RNA polymerase II nucleobase-containing compound biosynthetic process nucleic acid metabolic process positive regulation of RNA metabolic process positive regulation of RNA biosynthetic process regulation of DNA-templated transcription import into cell receptor internalization transport vesicle-mediated transport localization G protein-coupled receptor internalization establishment of localization receptor-mediated endocytosis endocytosis positive regulation of cell communication positive regulation of signal transduction intracellular signal transduction positive regulation of response to stimulus positive regulation of ERK1 and ERK2 cascade regulation of intracellular signal transduction intracellular signaling cassette positive regulation of MAPK cascade positive regulation of intracellular signal transduction regulation of MAPK cascade MAPK cascade ERK1 and ERK2 cascade regulation of ERK1 and ERK2 cascade positive regulation of signaling establishment of protein localization protein transport macromolecule localization intracellular protein localization regulation of localization regulation of cellular component organization positive regulation of cellular component organization regulation of receptor internalization positive regulation of endocytosis positive regulation of receptor-mediated endocytosis regulation of endocytosis regulation of transport regulation of receptor-mediated endocytosis regulation of vesicle-mediated transport positive regulation of receptor internalization positive regulation of transport small GTPase-mediated signal transduction regulation of small GTPase mediated signal transduction Rho protein signal transduction regulation of Rho protein signal transduction positive regulation of Rho protein signal transduction positive regulation of small GTPase mediated signal transduction proteasomal protein catabolic process proteasome-mediated ubiquitin-dependent protein catabolic process cell surface receptor signaling pathway Notch signaling pathway negative regulation of Notch signaling pathway regulation of Notch signaling pathway positive regulation of phosphorylation regulation of protein phosphorylation positive regulation of protein metabolic process positive regulation of phosphate metabolic process positive regulation of protein modification process phosphate-containing compound metabolic process positive regulation of protein phosphorylation phosphorus metabolic process protein phosphorylation positive regulation of phosphorus metabolic process phosphorylation regulation of phosphorus metabolic process regulation of phosphorylation	cell projection cellular anatomical structure pseudopodium plasma membrane bounded cell projection clathrin-coated pit membrane endomembrane system intracellular anatomical structure cytoplasm cytosol intracellular organelle organelle membraneless organelle intracellular membraneless organelle cell projection cellular anatomical structure pseudopodium plasma membrane bounded cell projection clathrin-coated pit membrane endomembrane system intracellular anatomical structure cytoplasm cytosol intracellular organelle organelle membraneless organelle intracellular membraneless organelle chromatin chromosome membrane-bounded organelle intracellular vesicle intracellular membrane-bounded organelle cytoplasmic vesicle membrane bounding membrane of organelle cytoplasmic vesicle vesicle membrane endocytic vesicle membrane vesicle organelle membrane endocytic vesicle vacuolar membrane lytic vacuole vacuole lytic vacuole membrane lysosomal membrane lysosome Golgi membrane Golgi apparatus cell periphery plasma membrane nucleus membrane-enclosed lumen intracellular organelle lumen nucleoplasm organelle lumen nuclear lumen nuclear body

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
D [auth V]	IPR000161	Vasopressin V2 receptor	Family
D [auth V]	IPR000276	G protein-coupled receptor, rhodopsin-like	Family
D [auth V]	IPR017452	GPCR, rhodopsin-like, 7TM	Domain
D [auth V]	IPR001817	Vasopressin receptor	Family
C [auth R]	IPR010980	Cytochrome c/b562	Homologous Superfamily
C [auth R]	IPR009155	Cytochrome b562	Family
C [auth R]	IPR000810	Cannabinoid receptor type 1	Family
C [auth R]	IPR002230	Cannabinoid receptor family	Family
C [auth R]	IPR000276	G protein-coupled receptor, rhodopsin-like	Family
C [auth R]	IPR017452	GPCR, rhodopsin-like, 7TM	Domain
A	IPR011022	Arrestin-like, C-terminal domain	Domain
A	IPR000698	Arrestin	Family
A	IPR014753	Arrestin, N-terminal	Homologous Superfamily
A	IPR014756	Immunoglobulin E-set	Homologous Superfamily
A	IPR014752	Arrestin-like, C-terminal domain superfamily	Homologous Superfamily
A	IPR011021	Arrestin-like, N-terminal	Domain
A	IPR017864	Arrestin, conserved site	Conserved Site

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
D [auth V]	Pharos: P30518	nephrogenic diabetes insipidus nephrogenic syndrome of inappropriate antidiuresis congenital adrenal hyperplasia cardiomyopathy congestive heart failure diabetes insipidus, nephrogenic, X-linked Oliguria diabetes insipidus X-linked disease inappropriate ADH syndrome hereditary von Willebrand disease intellectual disability systemic lupus erythematosus kidney disease diabetes insipidus, nephrogenic, autosomal nephrogenic diabetes insipidus nephrogenic syndrome of inappropriate antidiuresis congenital adrenal hyperplasia cardiomyopathy congestive heart failure diabetes insipidus, nephrogenic, X-linked Oliguria diabetes insipidus X-linked disease inappropriate ADH syndrome hereditary von Willebrand disease intellectual disability systemic lupus erythematosus kidney disease diabetes insipidus, nephrogenic, autosomal hemophilia A autosomal dominant hypophosphatemic rickets rheumatoid arthritis celiac disease genetic endocrine growth disease heart failure
C [auth R]	Pharos: P21554	obesity disorder cannabis dependence pancreatitis rhabdomyosarcoma status epilepticus Huntington disease Pain temporal lobe epilepsy cocaine abuse visual epilepsy endometriosis substance withdrawal syndrome cirrhosis of liver cocaine dependence multiple sclerosis obesity disorder cannabis dependence pancreatitis rhabdomyosarcoma status epilepticus Huntington disease Pain temporal lobe epilepsy cocaine abuse visual epilepsy endometriosis substance withdrawal syndrome cirrhosis of liver cocaine dependence multiple sclerosis schizophrenia cutaneous melanoma lung adenocarcinoma malignant colon neoplasm bipolar disorder malignant pancreatic neoplasm pancreatic intraductal papillary-mucinous neoplasm medulloblastoma common cold anxiety disorder depressive disorder drug dependence oligodendroglioma large cell medulloblastoma attention deficit hyperactivity disorder, inattentive type ovarian cancer lung cancer binge eating disorder malignant ependymoma breast cancer pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia monogenic obesity psoriasis Alzheimer disease interstitial cystitis ductal breast carcinoma in situ substance dependence atypical teratoid rhabdoid tumor substance-related disorder major depressive disorder pancreatic intraductal papillary-mucinous carcinoma glioblastoma pancreatic neoplasm tuberculosis migraine disorder pituitary cancer adenoma movement disorder allergic rhinitis hypotensive disorder non-small cell lung carcinoma invasive ductal breast carcinoma astrocytic tumor substance abuse juvenile Huntington disease osteosarcoma
A	Pharos: P49407	cirrhosis of liver pilocytic astrocytoma ulcerative colitis adrenal cortex carcinoma breast cancer Fibrosis, Liver large cell medulloblastoma lung carcinoma malignant glioma osteosarcoma astrocytic tumor glioblastoma lung adenocarcinoma major depressive disorder malignant mesothelioma cirrhosis of liver pilocytic astrocytoma ulcerative colitis adrenal cortex carcinoma breast cancer Fibrosis, Liver large cell medulloblastoma lung carcinoma malignant glioma osteosarcoma astrocytic tumor glioblastoma lung adenocarcinoma major depressive disorder malignant mesothelioma ovarian cancer tuberculosis atypical teratoid rhabdoid tumor ductal breast carcinoma in situ invasive ductal breast carcinoma lung cancer malignant ependymoma non-small cell lung carcinoma

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A, C [auth R], D [auth V]	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A, C [auth R], D [auth V]	MemProtMD	Annotated as membrane protein by MemProtMD

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
D [auth V]	SEP	Parent Component: SER RESID: AA0037 PSI-MOD : O-phospho-L-serine MOD:00046
D [auth V]	TPO	Parent Component: THR RESID: AA0037 , AA0038 PSI-MOD : O-phospho-L-serine MOD:00046 , O-phospho-L-threonine MOD:00047

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.