4XH2 | pdb_00004xh2

Crystal structure of human paxillin LD4 motif in complex with Fab fragment

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
L	V-set	e4xh2L1	A: alpha bundles	X: Ribosomal protein S7	H: HypA Ni-binding domain	T: HypA Ni-binding domain	F: V-set	ECOD (develop294)
K	V-set	e4xh2K1	A: alpha bundles	X: Ribosomal protein S7	H: HypA Ni-binding domain	T: HypA Ni-binding domain	F: V-set	ECOD (develop294)
I	V-set	e4xh2I1	A: alpha bundles	X: Ribosomal protein S7	H: HypA Ni-binding domain	T: HypA Ni-binding domain	F: V-set	ECOD (develop294)
F	V-set	e4xh2F1	A: alpha bundles	X: Ribosomal protein S7	H: HypA Ni-binding domain	T: HypA Ni-binding domain	F: V-set	ECOD (develop294)
D	V-set	e4xh2D1	A: alpha bundles	X: Ribosomal protein S7	H: HypA Ni-binding domain	T: HypA Ni-binding domain	F: V-set	ECOD (develop294)
B	V-set	e4xh2B1	A: alpha bundles	X: Ribosomal protein S7	H: HypA Ni-binding domain	T: HypA Ni-binding domain	F: V-set	ECOD (develop294)
J	V-set	e4xh2J2	A: alpha bundles	X: Ribosomal protein S7	H: HypA Ni-binding domain	T: HypA Ni-binding domain	F: V-set	ECOD (develop294)
J	EF-hand_1, EF-hand_6, EF-hand_7	e4xh2J1	A: alpha bundles	X: Lipocalins/Streptavidin	H: SAM/DNA-glycosylase	T: SAM domain-like	F: EF-hand_1, EF-hand_6, EF-hand_7	ECOD (develop294)
H	V-set	e4xh2H2	A: alpha bundles	X: Ribosomal protein S7	H: HypA Ni-binding domain	T: HypA Ni-binding domain	F: V-set	ECOD (develop294)
H	EF-hand_1, EF-hand_6, EF-hand_7	e4xh2H1	A: alpha bundles	X: Lipocalins/Streptavidin	H: SAM/DNA-glycosylase	T: SAM domain-like	F: EF-hand_1, EF-hand_6, EF-hand_7	ECOD (develop294)
G	V-set	e4xh2G1	A: alpha bundles	X: Ribosomal protein S7	H: HypA Ni-binding domain	T: HypA Ni-binding domain	F: V-set	ECOD (develop294)
G	EF-hand_1, EF-hand_6, EF-hand_7	e4xh2G2	A: alpha bundles	X: Lipocalins/Streptavidin	H: SAM/DNA-glycosylase	T: SAM domain-like	F: EF-hand_1, EF-hand_6, EF-hand_7	ECOD (develop294)
E	V-set	e4xh2E2	A: alpha bundles	X: Ribosomal protein S7	H: HypA Ni-binding domain	T: HypA Ni-binding domain	F: V-set	ECOD (develop294)
E	EF-hand_1, EF-hand_6, EF-hand_7	e4xh2E1	A: alpha bundles	X: Lipocalins/Streptavidin	H: SAM/DNA-glycosylase	T: SAM domain-like	F: EF-hand_1, EF-hand_6, EF-hand_7	ECOD (develop294)
C	V-set	e4xh2C2	A: alpha bundles	X: Ribosomal protein S7	H: HypA Ni-binding domain	T: HypA Ni-binding domain	F: V-set	ECOD (develop294)
C	EF-hand_1, EF-hand_6, EF-hand_7	e4xh2C3	A: alpha bundles	X: Lipocalins/Streptavidin	H: SAM/DNA-glycosylase	T: SAM domain-like	F: EF-hand_1, EF-hand_6, EF-hand_7	ECOD (develop294)
A	V-set	e4xh2A1	A: alpha bundles	X: Ribosomal protein S7	H: HypA Ni-binding domain	T: HypA Ni-binding domain	F: V-set	ECOD (develop294)
A	EF-hand_1, EF-hand_6, EF-hand_7	e4xh2A2	A: alpha bundles	X: Lipocalins/Streptavidin	H: SAM/DNA-glycosylase	T: SAM domain-like	F: EF-hand_1, EF-hand_6, EF-hand_7	ECOD (develop294)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
L	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
K	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
I	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
F	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
D	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
J	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
H	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
G	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
E	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
A	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)

IMGT Antibody Annotation IMGT Database Homepage

Chain	Protein Name	Description	Organism Name	Gene Allele Name(s)	Domain Name(s)	Receptor Type	Receptor Description	Provenance Source
B, D, F, I, K B, D, F, I, K, L	Fab	L-KAPPA	Homo sapiens (human)	IGKV1D-1301, IGKV1-1302, IGKV1-3901, IGKV1D-3901, IGKV1D-1302, IGKJ101, IGKC*01	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202610-0)
A, C, E, G, H A, C, E, G, H, J	Fab	VH-CH1	Homo sapiens (human)	IGHV3-4801, IGHV3-4804, IGHJ601, IGHJ602, IGHG101, IGHG102, IGHG104, IGHG105	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202610-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B, D, F, I, K B, D, F, I, K, L	Light Chain	IGKV1	Kappa	-	SAbDab (2026-03-20)
A, C, E, G, H A, C, E, G, H, J	Heavy Chain	IGHV3	-	-	SAbDab (2026-03-20)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
M [auth a], N [auth c], O [auth e], P [auth g], Q [auth h], M [auth a], N [auth c], O [auth e], P [auth g], Q [auth h], R [auth j]	paxillin LD4	cytoskeletal protein binding protein binding binding vinculin binding protein phosphatase binding phosphatase binding enzyme binding signaling receptor binding neuropilin binding beta-catenin binding cation binding ion binding metal ion binding small molecule binding	endothelial cell migration cell migration cellular process cell motility cell adhesion substrate adhesion-dependent cell spreading cell-substrate adhesion cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus signaling biological regulation signal transduction endothelial cell migration cell migration cellular process cell motility cell adhesion substrate adhesion-dependent cell spreading cell-substrate adhesion cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus signaling biological regulation signal transduction cell communication cellular response to nitrogen compound response to peptide hormone cellular response to growth hormone stimulus cell surface receptor protein tyrosine kinase signaling pathway cellular response to endogenous stimulus response to hormone enzyme-linked receptor protein signaling pathway cellular response to hormone stimulus growth hormone receptor signaling pathway cell surface receptor signaling pathway response to endogenous stimulus cellular response to peptide hormone stimulus response to oxygen-containing compound response to nitrogen compound cellular response to oxygen-containing compound response to growth hormone cellular response to chemical stimulus response to chemical cellular response to oxidative stress cellular response to chemical stress response to reactive oxygen species cellular response to reactive oxygen species response to oxidative stress cellular response to stress response to stress regulation of signaling protein-containing complex organization regulation of signal transduction cellular component organization cellular component biogenesis signal complex assembly cellular component assembly regulation of response to stimulus protein-containing complex assembly regulation of cell communication cellular component organization or biogenesis positive regulation of organelle organization regulation of cytoskeleton organization regulation of cellular component organization regulation of actin filament-based process positive regulation of cellular component organization positive regulation of biological process regulation of actin filament bundle assembly positive regulation of actin filament bundle assembly actin filament bundle organization positive regulation of stress fiber assembly actin filament-based process stress fiber assembly positive regulation of cellular process regulation of actin filament organization actin cytoskeleton organization actomyosin structure organization positive regulation of cellular component biogenesis positive regulation of cytoskeleton organization actin filament organization regulation of cellular component biogenesis positive regulation of supramolecular fiber organization regulation of organelle organization regulation of stress fiber assembly organelle organization contractile actin filament bundle assembly regulation of actomyosin structure organization regulation of actin cytoskeleton organization actin filament bundle assembly regulation of supramolecular fiber organization supramolecular fiber organization cytoskeleton organization cellular response to growth factor stimulus cell surface receptor protein serine/threonine kinase signaling pathway cellular response to transforming growth factor beta stimulus response to transforming growth factor beta transforming growth factor beta receptor signaling pathway response to growth factor transforming growth factor beta receptor superfamily signaling pathway	cellular anatomical structure anchoring junction cell junction focal adhesion cell-substrate junction cell projection cell leading edge plasma membrane bounded cell projection lamellipodium cell periphery cell cortex intracellular anatomical structure cytoplasm cell-cell junction cellular anatomical structure anchoring junction cell junction focal adhesion cell-substrate junction cell projection cell leading edge plasma membrane bounded cell projection lamellipodium cell periphery cell cortex intracellular anatomical structure cytoplasm cell-cell junction cytosol plasma membrane membrane actin filament bundle intracellular membraneless organelle actin cytoskeleton actomyosin intracellular organelle cytoskeleton organelle membraneless organelle stress fiber contractile actin filament bundle protein-containing complex microtubule associated complex microtubule cytoskeleton
B, D, F, I, K B, D, F, I, K, L	Fab Light Chain	-	-	-
A, C, E, G, H A, C, E, G, H, J	Fab Heavy Chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
M [auth a], N [auth c], O [auth e], P [auth g], Q [auth h], M [auth a], N [auth c], O [auth e], P [auth g], Q [auth h], R [auth j]	IPR001904	Paxillin, Lim domain 4	Domain
M [auth a], N [auth c], O [auth e], P [auth g], Q [auth h], M [auth a], N [auth c], O [auth e], P [auth g], Q [auth h], R [auth j]	IPR047072	Paxillin, Lim domain 2	Domain
M [auth a], N [auth c], O [auth e], P [auth g], Q [auth h], M [auth a], N [auth c], O [auth e], P [auth g], Q [auth h], R [auth j]	IPR001781	Zinc finger, LIM-type	Domain
M [auth a], N [auth c], O [auth e], P [auth g], Q [auth h], M [auth a], N [auth c], O [auth e], P [auth g], Q [auth h], R [auth j]	IPR047075	Paxillin/TGFB1I1, LIM domain 1	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
M [auth a], N [auth c], O [auth e], P [auth g], Q [auth h], M [auth a], N [auth c], O [auth e], P [auth g], Q [auth h], R [auth j]	Pharos: P49023	non-small cell lung carcinoma Neoplasm Metastasis attention deficit hyperactivity disorder, inattentive type glioblastoma cancer malignant ependymoma osteosarcoma malignant glioma polycystic ovary syndrome

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.