1QHO

FIVE-DOMAIN ALPHA-AMYLASE FROM BACILLUS STEAROTHERMOPHILUS, MALTOSE/ACARBOSE COMPLEX

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Structure Motif: Primary M-CSA Annotation

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1qhoa1	All beta proteins	Immunoglobulin-like beta-sandwich	E set domains	E-set domains of sugar-utilizing enzymes	Five domain 'maltogenic' alpha-amylase (glucan 1,4-alpha-maltohydrolase), domain D	(Geobacillus stearothermophilus ) [TaxId: 1422 ],	SCOPe (2.08)
A	d1qhoa2	All beta proteins	Prealbumin-like	Starch-binding domain-like	Starch-binding domain	Cyclodextrin glycosyltransferase, C-terminal domain	(Geobacillus stearothermophilus ) [TaxId: 1422 ],	SCOPe (2.08)
A	d1qhoa3	All beta proteins	Glycosyl hydrolase domain	Glycosyl hydrolase domain	alpha-Amylases, C-terminal beta-sheet domain	Cyclodextrin glycosyltransferase	(Geobacillus stearothermophilus ) [TaxId: 1422 ],	SCOPe (2.08)
A	d1qhoa4	Alpha and beta proteins (a/b)	TIM beta/alpha-barrel	(Trans)glycosidases	Amylase, catalytic domain	Cyclodextrin glycosyltransferase	(Geobacillus stearothermophilus ) [TaxId: 1422 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Starch-binding domain	8027893	4002096	SCOP2 (2022-06-29)
A	SCOP2 Family	alpha-Amylases, C-terminal beta-sheet domain	8030510	4002636	SCOP2 (2022-06-29)
A	SCOP2 Family	Amylase, catalytic domain	8030938	4003138	SCOP2 (2022-06-29)
A	SCOP2 Family	E-set domains of sugar-utilizing enzymes	8054918	4007565	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Starch-binding domain-like	8040272	3000816	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Glycosyl hydrolase domain-like	8042889	3001528	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	(Trans)glycosidases	8043317	3000313	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	E set domains	8054919	3000070	SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	TIG_2	e1qhoA1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: TIG_2	ECOD (1.6)
A	CBM_20	e1qhoA2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Prealbumin-like	F: CBM_20	ECOD (1.6)
A	Alpha-amylase_C	e1qhoA3	A: beta sandwiches	X: Glycosyl hydrolase domain-like	H: Glycosyl hydrolase domain (From Topology)	T: Glycosyl hydrolase domain	F: Alpha-amylase_C	ECOD (1.6)
A	Alpha-amylase	e1qhoA4	A: a/b barrels	X: TIM beta/alpha-barrel	H: TIM barrels (From Topology)	T: TIM barrels	F: Alpha-amylase	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.20.20.80	Alpha Beta	Alpha-Beta Barrel	TIM Barrel	Glycosidases	CATH (4.3.0)
A	2.60.40.1180	Mainly Beta	Sandwich	Immunoglobulin-like	Golgi alpha-mannosidase II	CATH (4.3.0)
A	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF01833	IPT/TIG domain (TIG)	IPT/TIG domain	This family consists of a domain that has an immunoglobulin like fold. These domains are found in cell surface receptors such as Met and Ron as well as in intracellular transcription factors where it is involved in DNA binding. CAUTION: This family d ...	This family consists of a domain that has an immunoglobulin like fold. These domains are found in cell surface receptors such as Met and Ron as well as in intracellular transcription factors where it is involved in DNA binding. CAUTION: This family does not currently recognise a significant number of members.	Domain
A	PF00128	Alpha amylase, catalytic domain (Alpha-amylase)	Alpha amylase, catalytic domain	Alpha amylase is classified as family 13 of the glycosyl hydrolases. The structure is an 8 stranded alpha/beta barrel containing the active site, interrupted by a ~70 a.a. calcium-binding domain protruding between beta strand 3 and alpha helix 3, a ...	Alpha amylase is classified as family 13 of the glycosyl hydrolases. The structure is an 8 stranded alpha/beta barrel containing the active site, interrupted by a ~70 a.a. calcium-binding domain protruding between beta strand 3 and alpha helix 3, and a carboxyl-terminal Greek key beta-barrel domain.	Domain
A	PF02806	Alpha amylase, C-terminal all-beta domain (Alpha-amylase_C)	Alpha amylase, C-terminal all-beta domain	Alpha amylase is classified as family 13 of the glycosyl hydrolases. The structure is an 8 stranded alpha/beta barrel containing the active site, interrupted by a ~70 a.a. calcium-binding domain protruding between beta strand 3 and alpha helix 3, a ...	Alpha amylase is classified as family 13 of the glycosyl hydrolases. The structure is an 8 stranded alpha/beta barrel containing the active site, interrupted by a ~70 a.a. calcium-binding domain protruding between beta strand 3 and alpha helix 3, and a carboxyl-terminal Greek key beta-barrel domain.	Domain
A	PF00686	Starch binding domain (CBM_20)	Starch binding domain	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	ALPHA-AMYLASE	starch binding binding polysaccharide binding carbohydrate binding hydrolase activity, acting on glycosyl bonds glucan 1,4-alpha-maltohydrolase activity hydrolase activity, hydrolyzing O-glycosyl compounds hydrolase activity catalytic activity amylase activity alpha-amylase activity cation binding ion binding metal ion binding starch binding binding polysaccharide binding carbohydrate binding hydrolase activity, acting on glycosyl bonds glucan 1,4-alpha-maltohydrolase activity hydrolase activity, hydrolyzing O-glycosyl compounds hydrolase activity catalytic activity amylase activity alpha-amylase activity cation binding ion binding metal ion binding small molecule binding	carbohydrate metabolic process primary metabolic process metabolic process cellular process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR013784	Carbohydrate-binding-like fold	Homologous Superfamily
A	IPR031319	Alpha-amylase, C-terminal domain	Domain
A	IPR002909	IPT domain	Domain
A	IPR017853	Glycoside hydrolase superfamily	Homologous Superfamily
A	IPR002044	Carbohydrate binding module family 20	Domain
A	IPR034849	Maltogenic alpha-amylase, CBM20 domain	Domain
A	IPR006047	Glycosyl hydrolase, family 13, catalytic domain	Domain
A	IPR006048	Alpha-amylase/branching enzyme, C-terminal all beta	Domain
A	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
A	IPR014756	Immunoglobulin E-set	Homologous Superfamily
A	IPR006046	Alpha amylase	Family
A	IPR013780	Glycosyl hydrolase, all-beta	Homologous Superfamily

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

Chains	Enzyme Name	Description	Catalytic Residues
A	glucan 1,4-alpha-maltohydrolase M-CSA #905	Alpha-amylases, which belong to glycoside hydrolase family 13, are 1,4-alpha-D-glucan glucanohydrolases, which degrade both the branched and unbranched forms of starch by cleaving the internal alpha-1,4 bonds connecting the glucose monomers. The products of these reactions are maltose and maltotriose, which are further degraded to glucose by maltases. One atom of calcium is required to bind to each protein molecule to allow it to function, but excess calcium can inhibit activity by binding to amino acids that are required for the catalytic activity of the enzyme.	Defined by 3 residues: ASP:A-228GLU:A-256ASP:A-329 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 3.2.1.133 (PDB Primary Data) Search M-CSA Motif + EC 3.2.1.133

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.