Annotations: 2XI9

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	F_UNCLASSIFIED	e2xi9A5	A: beta barrels	X: OB-fold	H: Pilus-presented adhesin barrel insertion domain (From Topology)	T: Pilus-presented adhesin barrel insertion domain	F: F_UNCLASSIFIED	ECOD (1.6)
A	PF17802	e2xi9A6	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Prealbumin-like	F: PF17802	ECOD (1.6)
A	PF08341	e2xi9A4	A: alpha arrays	X: Pilus-presented adhesin helical insertion domain (From Topology)	H: Pilus-presented adhesin helical insertion domain (From Topology)	T: Pilus-presented adhesin helical insertion domain	F: PF08341	ECOD (1.6)
B	F_UNCLASSIFIED	e2xi9B3	A: beta barrels	X: OB-fold	H: Pilus-presented adhesin barrel insertion domain (From Topology)	T: Pilus-presented adhesin barrel insertion domain	F: F_UNCLASSIFIED	ECOD (1.6)
B	PF17802	e2xi9B4	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Prealbumin-like	F: PF17802	ECOD (1.6)
B	PF08341	e2xi9B2	A: alpha arrays	X: Pilus-presented adhesin helical insertion domain (From Topology)	H: Pilus-presented adhesin helical insertion domain (From Topology)	T: Pilus-presented adhesin helical insertion domain	F: PF08341	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
A	2.30.30.670	Mainly Beta	Roll	SH3 type barrels.	Thioester domain	CATH (4.3.0)
A	1.10.150.480	Mainly Alpha	Orthogonal Bundle	DNA polymerase	domain 1	CATH (4.3.0)
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B	2.30.30.670	Mainly Beta	Roll	SH3 type barrels.	Thioester domain	CATH (4.3.0)
B	1.10.150.480	Mainly Alpha	Orthogonal Bundle	DNA polymerase	domain 1	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF08341	Thioester domain (TED)	Thioester domain	This domain is found near the N-terminus of a variety of bacterial surface proteins and pili. This domain contains an unusual covalent ester bond between a conserved cysteine and glutamine residue [1].	Domain
A, B	PF17802	Prealbumin-like fold domain (SpaA)	Prealbumin-like fold domain	This entry contains a prealbumin-like domain from a wide variety of bacterial surface proteins. This entry corresponds to domain 1 and domain 3 of SpaA from Corynebacterium diphtheriae [1]. Some members of this family contain an isopeptide bond.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	ANCILLARY PROTEIN 1	-	-	membrane cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
A, B	IPR046022	Domain of unknown function DUF5979	Domain
A, B	IPR041033	Prealbumin-like fold domain	Domain
A, B	IPR023849	TQXA domain	Domain
A, B	IPR013552	Thioester domain	Domain

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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 R01GM133198.