Annotations: 3ULS

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
D [auth B]	SmpA_OmlA	e3ulsB1	A: alpha bundles	X: beta-Grasp	H: HTH	T: winged helix domain	F: SmpA_OmlA	ECOD (develop294)
B [auth H]	Ribosomal_S30AE	e3ulsH1	A: alpha bundles	X: P-loop domains-like	H: Protein kinase/SAICAR synthase/ATP-grasp	T: Protein kinase	F: Ribosomal_S30AE	ECOD (develop294)
C [auth A]	Ribosomal_S30AE	e3ulsA1	A: alpha bundles	X: P-loop domains-like	H: Protein kinase/SAICAR synthase/ATP-grasp	T: Protein kinase	F: Ribosomal_S30AE	ECOD (develop294)
A [auth L]	RRM_1	e3ulsL1	A: alpha bundles	X: beta-Grasp	H: HTH	T: winged helix domain	F: RRM_1	ECOD (develop294)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
D [auth B]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C [auth A]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
A [auth L]	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 [auth H], D [auth B]	mAb12	VH-CH1	Homo sapiens (human)	IGHV6-101, IGHV6-102, IGHJ401, IGHJ402, IGHJ403, IGHG401, IGHG4*04	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-4_LAMBDA	IMGT (202610-0)
A [auth L], C [auth A]	mAb12	L-LAMBDA	Homo sapiens (human)	IGLV3-2101, IGLV3-2102, IGLJ201, IGLJ302, IGLJ301, IGLC201, IGLC202, IGLC304	V-DOMAIN V-LAMBDA, C-DOMAIN C-LAMBDA	IG	FAB-GAMMA-4_LAMBDA	IMGT (202610-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth H], D [auth B]	Heavy Chain	IGHV6	-	-	SAbDab (2026-03-20)
A [auth L], C [auth A]	Light Chain	IGLV3	Lambda	-	SAbDab (2026-03-20)

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
A [auth L], C [auth A]	PCA	Parent Component: GLN RESID: AA0031 PSI-MOD : 2-pyrrolidone-5-carboxylic acid (Gln) MOD:00040 , 2-pyrrolidone-5-carboxylic acid (Glu) MOD:00420

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.