Annotations: 7JGJ

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
C [auth H]	UCR_14kD	e7jgjH1	A: a/b three-layered sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: UCR_14kD	ECOD (v294.1)
B [auth L]	UCR_14kD	e7jgjL1	A: a/b three-layered sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: UCR_14kD	ECOD (v294.1)

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
C [auth H]	Antibody Fab fragment	VH-CH1	Mus musculus (house mouse)	IGHV1-4201, IGHJ401, IGHG1*02	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202613-0)
B [auth L]	Antibody Fab fragment	L-KAPPA	Mus musculus (house mouse)	IGKV4-6301, IGKJ401, IGKC01, IGKC02	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202613-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C [auth H]	Heavy Chain	IGHV1	-	immunoglobulin a1 protease	SAbDab (2026-04-10)
B [auth L]	Light Chain	IGKV4	Kappa	immunoglobulin a1 protease	SAbDab (2026-04-10)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF07581	The GLUG motif (Glug)	The GLUG motif	-	Family
A	PF07580	M26 IgA1-specific Metallo-endopeptidase C-terminal region (Peptidase_M26_C)	M26 IgA1-specific Metallo-endopeptidase C-terminal region	-	Family
A	PF05342	M26 IgA1-specific Metallo-endopeptidase N-terminal region (Peptidase_M26_N)	M26 IgA1-specific Metallo-endopeptidase N-terminal region	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C [auth H]	mAB Heavy Chain	-	-	-
B [auth L]	mAB Light Chain	-	-	-
A	Immunoglobulin A1 protease	cation binding transition metal ion binding zinc ion binding ion binding binding metal ion binding small molecule binding peptidase activity catalytic activity, acting on a protein metalloendopeptidase activity hydrolase activity metallopeptidase activity catalytic activity endopeptidase activity	proteolysis metabolic process cellular process primary metabolic process protein metabolic process macromolecule metabolic process	cellular anatomical structure membrane extracellular region

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR011505	Peptidase M26, C-terminal domain	Domain
A	IPR008006	Peptidase M26, N-terminal domain	Domain
A	IPR011493	GLUG	Domain
A	IPR005877	YSIRK Gram-positive signal peptide	Domain
A	IPR011098	G5 domain	Domain
A	IPR019931	LPXTG cell wall anchor motif	Conserved Site

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.