Annotations: 4IU2

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	F_UNCLASSIFIED	e4iu2A1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Common fold of diphtheria toxin/transcription factors/cytochrome f	F: F_UNCLASSIFIED	ECOD (1.6)
B	PF18244	e4iu2B1	A: beta sandwiches	X: Cellulose-binding protein CttA N-terminal domain (From Topology)	H: Cellulose-binding protein CttA N-terminal domain (From Topology)	T: Cellulose-binding protein CttA N-terminal domain	F: PF18244	ECOD (1.6)
B	F_UNCLASSIFIED	e4iu2B2	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: Type I dockerin domain	F: F_UNCLASSIFIED	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.60.40.680	Mainly Beta	Sandwich	Immunoglobulin-like		CATH (4.3.0)
B	2.60.40.3810	Mainly Beta	Sandwich	Immunoglobulin-like		CATH (4.3.0)
B	1.10.1330.10	Mainly Alpha	Orthogonal Bundle	Type 1 dockerin domain	Dockerin domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
B	PF18244	Cellulose-binding protein CttA N-terminal domain (CttA_N)	Cellulose-binding protein CttA N-terminal domain	This is the N-terminal domain of cellulose-binding protein CttA present in Ruminococcus flavefaciens. CttA mediates attachment of the bacterial substrate via two carbohydrate-binding modules. The domain is known as the X-module and lacks a true hydr ...	This is the N-terminal domain of cellulose-binding protein CttA present in Ruminococcus flavefaciens. CttA mediates attachment of the bacterial substrate via two carbohydrate-binding modules. The domain is known as the X-module and lacks a true hydrophobic core. Unlike the X-modules in other types of CohE-XDoc complexes it does not contribute to the binding surface. This X-module appears to serve as an extended spacer, which separates the cellulose-binding modules at the N terminus of CttA and the bacterial cell wall. The domain does not share structural similarity with other known X-modules from cellulolytic bacteria but does show similarity to G5-1 module of StrH from S. pneumoniae [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Cell-wall anchoring protein	binding carbohydrate binding cation binding ion binding metal ion binding small molecule binding	-	membrane cellular anatomical entity
B	Cellulose-binding protein	cation binding ion binding binding metal ion binding small molecule binding	carbohydrate metabolic process catabolic process carbohydrate catabolic process primary metabolic process macromolecule catabolic process polysaccharide metabolic process organic substance metabolic process polysaccharide catabolic process metabolic process macromolecule metabolic process organic substance catabolic process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR008965	CBM2/CBM3, carbohydrate-binding domain superfamily	Homologous Superfamily
B	IPR033802	Carbohydrate-binding protein CttA, X module	Domain
B	IPR036439	Dockerin domain superfamily	Homologous Superfamily
B	IPR040959	Cellulose-binding protein CttA, N-terminal	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.