Annotations: 3K1J

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	AAA_32_3rd	e3k1jA1	A: alpha arrays	X: Histone-like	H: Histone-related	T: AAA+ ATPase lid domain	F: AAA_32_3rd	ECOD (1.6)
A	Lon_C_N	e3k1jA4	A: a+b two layers	X: Ribosomal protein S5 domain 2-like (From Topology)	H: Ribosomal protein S5 domain 2-like (From Topology)	T: Ribosomal protein S5 domain 2-like	F: Lon_C_N	ECOD (1.6)
A	PRK13765	e3k1jA5	A: a+b two layers	X: Lon-like protease MtaLonC helical domain (From Topology)	H: Lon-like protease MtaLonC helical domain (From Topology)	T: Lon-like protease MtaLonC helical domain	F: PRK13765	ECOD (1.6)
A	Sigma54_activat	e3k1jA2	A: a/b three-layered sandwiches	X: P-loop domains-like	H: P-loop domains-related	T: P-loop containing nucleoside triphosphate hydrolases	F: Sigma54_activat	ECOD (1.6)
A	Lon_C_C	e3k1jA3	A: a/b three-layered sandwiches	X: C-terminal subdomain in Lon-related proteases catalytic domains (From Topology)	H: C-terminal subdomain in Lon-related proteases catalytic domains (From Topology)	T: C-terminal subdomain in Lon-related proteases catalytic domains	F: Lon_C_C	ECOD (1.6)
B	AAA_32_3rd	e3k1jB2	A: alpha arrays	X: Histone-like	H: Histone-related	T: AAA+ ATPase lid domain	F: AAA_32_3rd	ECOD (1.6)
B	Lon_C_N	e3k1jB5	A: a+b two layers	X: Ribosomal protein S5 domain 2-like (From Topology)	H: Ribosomal protein S5 domain 2-like (From Topology)	T: Ribosomal protein S5 domain 2-like	F: Lon_C_N	ECOD (1.6)
B	PRK13765	e3k1jB3	A: a+b two layers	X: Lon-like protease MtaLonC helical domain (From Topology)	H: Lon-like protease MtaLonC helical domain (From Topology)	T: Lon-like protease MtaLonC helical domain	F: PRK13765	ECOD (1.6)
B	Sigma54_activat	e3k1jB4	A: a/b three-layered sandwiches	X: P-loop domains-like	H: P-loop domains-related	T: P-loop containing nucleoside triphosphate hydrolases	F: Sigma54_activat	ECOD (1.6)
B	Lon_C_C	e3k1jB1	A: a/b three-layered sandwiches	X: C-terminal subdomain in Lon-related proteases catalytic domains (From Topology)	H: C-terminal subdomain in Lon-related proteases catalytic domains (From Topology)	T: C-terminal subdomain in Lon-related proteases catalytic domains	F: Lon_C_C	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.50.300	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	P-loop containing nucleotide triphosphate hydrolases	CATH (4.3.0)
A	1.10.8.60	Mainly Alpha	Orthogonal Bundle	Helicase, Ruva Protein	domain 3	CATH (4.3.0)
A	3.30.230.10	Alpha Beta	2-Layer Sandwich	Ribosomal Protein S5	domain 2	CATH (4.3.0)
B	3.40.50.300	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	P-loop containing nucleotide triphosphate hydrolases	CATH (4.3.0)
B	1.10.8.60	Mainly Alpha	Orthogonal Bundle	Helicase, Ruva Protein	domain 3	CATH (4.3.0)
B	3.30.230.10	Alpha Beta	2-Layer Sandwich	Ribosomal Protein S5	domain 2	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF05362	Lon protease (S16) C-terminal proteolytic domain (Lon_C)	Lon protease (S16) C-terminal proteolytic domain	The Lon serine proteases must hydrolyse ATP to degrade protein substrates. In Escherichia coli, these proteases are involved in turnover of intracellular proteins, including abnormal proteins following heat-shock. The active site for protease activit ...	The Lon serine proteases must hydrolyse ATP to degrade protein substrates. In Escherichia coli, these proteases are involved in turnover of intracellular proteins, including abnormal proteins following heat-shock. The active site for protease activity resides in a C-terminal domain. The Lon proteases are classified as family S16 in Merops.	Domain
A, B	PF01078	Magnesium chelatase, subunit ChlI (Mg_chelatase)	Magnesium chelatase, subunit ChlI	Magnesium-chelatase is a three-component enzyme that catalyses the insertion of Mg2+ into protoporphyrin IX. This is the first unique step in the synthesis of (bacterio)chlorophyll. Due to this, it is thought that Mg-chelatase has an important ro ...	Magnesium-chelatase is a three-component enzyme that catalyses the insertion of Mg2+ into protoporphyrin IX. This is the first unique step in the synthesis of (bacterio)chlorophyll. Due to this, it is thought that Mg-chelatase has an important role in channelling inter- mediates into the (bacterio)chlorophyll branch in response to conditions suitable for photosynthetic growth. ChlI and BchD have molecular weight between 38-42 kDa.	Domain
A, B	PF00158	Sigma-54 interaction domain (Sigma54_activat)	Sigma-54 interaction domain		Domain
A, B	PF20436	Archaeal LonB, AAA+ ATPase LID domain (LonB_AAA-LID)	Archaeal LonB, AAA+ ATPase LID domain	The species-specific Lon-insertion domain (LID) is characteristic of Lon proteases (also known as endopeptidase La) and is fused to the AAA+ module [1]. Bacterial and eukaryotic Lons (LonA) have a LID at the N-terminal of AAA+ module; in archaeal Lon ...	The species-specific Lon-insertion domain (LID) is characteristic of Lon proteases (also known as endopeptidase La) and is fused to the AAA+ module [1]. Bacterial and eukaryotic Lons (LonA) have a LID at the N-terminal of AAA+ module; in archaeal Lons (LonB) the LID, represented in this entry, is inserted within the AAA+ module in a series of transmembrane segments known as the membrane-anchoring region (MA). In the Lon-like protease LonC, which does not have ATPase activity, the LID is also within the AAA-like module similar to LonBs; in this case, it is predicted to contain coiled-coil regions rather than transmembrane segments [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	ATP-dependent protease Lon	binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding pyrophosphatase activity ATP hydrolysis activity ribonucleoside triphosphate phosphatase activity hydrolase activity, acting on acid anhydrides, in phosphorus-containing anhydrides hydrolase activity hydrolase activity, acting on acid anhydrides catalytic activity ATP-dependent activity peptidase activity catalytic activity, acting on a protein serine hydrolase activity serine-type peptidase activity serine-type endopeptidase activity endopeptidase activity ATP-dependent peptidase activity	regulation of cellular process RNA metabolic process regulation of primary metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process DNA-templated transcription regulation of RNA metabolic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process regulation of biosynthetic process regulation of biological process biological regulation primary metabolic process regulation of cellular process RNA metabolic process regulation of primary metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process DNA-templated transcription regulation of RNA metabolic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process regulation of biosynthetic process regulation of biological process biological regulation primary metabolic process regulation of macromolecule metabolic process nucleobase-containing compound biosynthetic process gene expression macromolecule biosynthetic process nucleic acid metabolic process regulation of gene expression biosynthetic process cellular process metabolic process regulation of macromolecule biosynthetic process regulation of DNA-templated transcription macromolecule metabolic process regulation of metabolic process catabolic process protein catabolic process protein metabolic process macromolecule catabolic process proteolysis	cell periphery cellular anatomical structure plasma membrane membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR002078	RNA polymerase sigma factor 54 interaction domain	Domain
A, B	IPR000523	Magnesium chelatase ChlI-like, catalytic domain	Domain
A, B	IPR004663	Lon protease, archaeal	Family
A, B	IPR003593	AAA+ ATPase domain	Domain
A, B	IPR008269	Peptidase S16, Lon proteolytic domain	Domain
A, B	IPR027065	Lon protease	Family
A, B	IPR020568	Ribosomal protein uS5 domain 2-type superfamily	Homologous Superfamily
A, B	IPR046843	LonB, AAA+ ATPase LID domain, archaeal-type	Domain
A, B	IPR027417	P-loop containing nucleoside triphosphate hydrolase	Homologous Superfamily
A, B	IPR014721	Small ribosomal subunit protein uS5 domain 2-type fold, subgroup	Homologous Superfamily

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.