Annotations: 7XLI

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B	Heavy Chain	IGHV1	-	fur-regulated protein b	SAbDab (2025-12-19)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF05031	Iron Transport-associated domain (NEAT)	Iron Transport-associated domain	NEAT domains are heme and/or hemoprotein-binding modules highly conserved in secondary structure [1]. They have roles in hemoprotein binding, heme extraction and heme transfer [2]	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
B	VHH6 nanobody	-	-	-
A	Iron-regulated surface determinant protein B	heme transmembrane transporter activity transporter activity transmembrane transporter activity cation binding ion binding binding metal ion binding small molecule binding	-	cellular anatomical structure extracellular region

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR005877	YSIRK Gram-positive signal peptide	Domain
A	IPR050436	Iron-regulated surface determinant protein A	Family
A	IPR006635	NEAT domain	Domain
A	IPR048652	Iron-regulated surface determinant protein H/B, linker domain	Domain
A	IPR019929	Iron-regulated surface determinant protein IsdB	Family
A	IPR037250	NEAT domain superfamily	Homologous Superfamily
A	IPR019931	LPXTG cell wall anchor domain	Domain

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.