Annotations: 4PAC

Crystal Structure of Histidine-containing Phosphotransfer Protein AHP2 from Arabidopsis thaliana

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

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d4paca1	All alpha proteins	Four-helical up-and-down bundle	Histidine-containing phosphotransfer domain, HPT domain	automated matches	automated matches	Mouse-ear cress (Arabidopsis thaliana ) [TaxId: 3702 ],	SCOPe (2.08)
A	d4paca2	Artifacts	Tags	Tags	Tags	N-terminal Tags	Mouse-ear cress (Arabidopsis thaliana ) [TaxId: 3702 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Phosphorelay protein-like	8086571	4000835	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Histidine-containing phosphotransfer domain, HPT domain	8086572	3001634	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	WD40	e4pacA1	A: beta barrels	X: OB-fold	H: Phage tail fiber protein trimerization domain	T: 7-bladed	F: WD40	ECOD (v294.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.20.120.160	Mainly Alpha	Up-down Bundle	Four Helix Bundle (Hemerythrin (Met), subunit A)	HPT domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF01627	Hpt domain (Hpt)	Hpt domain	The histidine-containing phosphotransfer (HPt) domain is a novel protein module with an active histidine residue that mediates phosphotransfer reactions in the two-component signaling systems. A multistep phosphorelay involving the HPt domain has bee ...	The histidine-containing phosphotransfer (HPt) domain is a novel protein module with an active histidine residue that mediates phosphotransfer reactions in the two-component signaling systems. A multistep phosphorelay involving the HPt domain has been suggested for these signaling pathways. The crystal structure of the HPt domain of the anaerobic sensor kinase ArcB has been determined [1]. The domain consists of six alpha helices containing a four-helix bundle-folding. The pattern of sequence similarity of the HPt domains of ArcB and components in other signaling systems can be interpreted in light of the three-dimensional structure and supports the conclusion that the HPt domains have a common structural motif both in prokaryotes and eukaryotes. In S. cerevisiae ypd1p this domain has been shown to contain a binding surface for Ssk1p (response regulator receiver domain containing protein Pfam:PF00072) [2].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Histidine-containing phosphotransfer protein 2	protein histidine kinase binding protein binding binding kinase binding enzyme binding protein kinase binding molecular transducer activity catalytic activity, acting on a protein kinase activity histidine phosphotransfer kinase activity protein kinase activity transferase activity catalytic activity phosphotransferase activity, alcohol group as acceptor protein histidine kinase binding protein binding binding kinase binding enzyme binding protein kinase binding molecular transducer activity catalytic activity, acting on a protein kinase activity histidine phosphotransfer kinase activity protein kinase activity transferase activity catalytic activity phosphotransferase activity, alcohol group as acceptor transferase activity, transferring phosphorus-containing groups	cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus signaling response to endogenous stimulus biological regulation cellular response to cytokinin stimulus hormone-mediated signaling pathway cell communication cellular response to endogenous stimulus cytokinin-activated signaling pathway cellular response to chemical stimulus response to hormone response to cytokinin cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus signaling response to endogenous stimulus biological regulation cellular response to cytokinin stimulus hormone-mediated signaling pathway cell communication cellular response to endogenous stimulus cytokinin-activated signaling pathway cellular response to chemical stimulus response to hormone response to cytokinin response to chemical cellular process signal transduction cellular response to hormone stimulus phosphorelay signal transduction system intracellular signal transduction developmental process multicellular organismal process antipodal cell differentiation cellular developmental process megagametogenesis multicellular organism development gametophyte development cell differentiation anatomical structure development embryo sac development sexual reproduction reproductive process multicellular organismal reproductive process female gamete generation developmental process involved in reproduction gamete generation embryo sac egg cell differentiation	cellular anatomical structure intracellular anatomical structure cytoplasm cytosol membrane-bounded organelle intracellular organelle organelle nucleus intracellular membrane-bounded organelle

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR045871	Histidine-containing phosphotransfer protein 1-5/Phosphorelay intermediate protein YPD1	Family
A	IPR036641	HPT domain superfamily	Homologous Superfamily
A	IPR008207	Signal transduction histidine kinase, phosphotransfer (Hpt) domain	Domain

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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.