Annotations: 4EUK

Domain Annotation: SCOP/SCOPe Classification SCOP Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d4euka_	Alpha and beta proteins (a/b)	Flavodoxin-like	CheY-like	automated matches	automated matches	mouse-ear cress,thale-cress (Arabidopsis thaliana ) [TaxId: 3702 ],	SCOPe (2.08)
B	d4eukb_	All alpha proteins	Four-helical up-and-down bundle	Histidine-containing phosphotransfer domain, HPT domain	automated matches	automated matches	mouse-ear cress,thale-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	CheY-related	8072883	4003632	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	CheY-like	8072884	3001156	SCOP2 (2022-06-29)
B	SCOP2 Family	Phosphorelay protein-like	8086567	4000835	SCOP2 (2022-06-29)
B	SCOP2 Superfamily	Histidine-containing phosphotransfer domain HPT domain	8086568	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	Response_reg	e4eukA1	A: a/b three-layered sandwiches	X: Flavodoxin-like	H: Class I glutamine amidotransferase-like	T: CheY-like	F: Response_reg	ECOD (1.6)
B	Hpt	e4eukB1	A: alpha bundles	X: Four-helical up-and-down bundle	H: Histidine-containing phosphotransfer domain, HPT domain (From Topology)	T: Histidine-containing phosphotransfer domain, HPT domain	F: Hpt	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.50.2300	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Response regulator	CATH (4.3.0)
B	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	PF00072	Response regulator receiver domain (Response_reg)	Response regulator receiver domain	This domain receives the signal from the sensor partner in bacterial two-component systems. It is usually found N-terminal to a DNA binding effector domain.	Domain
B	PF01627	Hpt domain (Hpt)	Hpt domain	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Histidine kinase 5	catalytic activity, acting on a protein small molecule sensor activity kinase activity protein kinase activity transferase activity phosphotransferase activity, nitrogenous group as acceptor phosphotransferase activity, alcohol group as acceptor protein histidine kinase activity transferase activity, transferring phosphorus-containing groups phosphorelay sensor kinase activity catalytic activity cation binding ion binding binding catalytic activity, acting on a protein small molecule sensor activity kinase activity protein kinase activity transferase activity phosphotransferase activity, nitrogenous group as acceptor phosphotransferase activity, alcohol group as acceptor protein histidine kinase activity transferase activity, transferring phosphorus-containing groups phosphorelay sensor kinase activity catalytic activity cation binding ion binding binding metal ion binding small molecule binding	cellular response to stimulus response to organic substance regulation of cellular process response to stimulus response to lipid abscisic acid-activated signaling pathway signaling hormone-mediated signaling pathway cell communication cellular response to endogenous stimulus response to hormone cellular response to organic substance signal transduction cellular response to hormone stimulus cellular response to stimulus response to organic substance regulation of cellular process response to stimulus response to lipid abscisic acid-activated signaling pathway signaling hormone-mediated signaling pathway cell communication cellular response to endogenous stimulus response to hormone cellular response to organic substance signal transduction cellular response to hormone stimulus cellular response to abscisic acid stimulus regulation of biological process response to abscisic acid response to alcohol response to endogenous stimulus biological regulation response to oxygen-containing compound cellular response to oxygen-containing compound cellular response to chemical stimulus cellular response to alcohol response to chemical cellular response to lipid cellular process cellular response to cytokinin stimulus cytokinin-activated signaling pathway response to cytokinin defense response response to stress developmental process multicellular organism development multicellular organismal process plant organ development anatomical structure development root development system development root system development cellular response to oxidative stress cellular response to chemical stress cellular response to hydrogen peroxide response to reactive oxygen species response to inorganic substance response to hydrogen peroxide response to oxidative stress cellular response to reactive oxygen species cellular response to stress biological process involved in interspecies interaction between organisms response to other organism response to external stimulus cellular response to molecule of bacterial origin response to biotic stimulus cellular response to biotic stimulus response to bacterium response to external biotic stimulus response to molecule of bacterial origin intracellular signal transduction ethylene-activated signaling pathway response to ethylene phosphorelay signal transduction system cellular response to ethylene stimulus regulation of stomatal movement stomatal closure stomatal movement regulation of stomatal closure negative regulation of signaling negative regulation of intracellular signal transduction negative regulation of biological process regulation of signal transduction negative regulation of cell communication regulation of phosphorelay signal transduction system regulation of ethylene-activated signaling pathway regulation of intracellular signal transduction negative regulation of cellular process regulation of signaling negative regulation of phosphorelay signal transduction system negative regulation of response to stimulus negative regulation of ethylene-activated signaling pathway negative regulation of signal transduction regulation of response to stimulus regulation of cell communication regulation of cellular response to alcohol negative regulation of cellular response to alcohol regulation of response to alcohol negative regulation of abscisic acid-activated signaling pathway regulation of abscisic acid-activated signaling pathway negative regulation of response to alcohol cellular response to nitrogen compound cellular response to inorganic substance response to nitrogen compound cellular response to nitric oxide response to nitric oxide cellular response to reactive nitrogen species	cell periphery plasma membrane membrane cellular anatomical entity intracellular anatomical structure cytoplasm membrane-bounded organelle intracellular organelle organelle plant-type vacuole vacuole intracellular membrane-bounded organelle
B	Histidine-containing phosphotransfer protein 1	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 response to organic substance 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 cellular response to stimulus response to organic substance 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 cellular response to organic substance signal transduction cellular response to hormone stimulus phosphorelay signal transduction system intracellular signal transduction developmental process multicellular organism development multicellular organismal process gametophyte development anatomical structure development embryo sac development growth cell growth multidimensional cell growth	intracellular anatomical structure cytoplasm cellular anatomical entity cytosol membrane-bounded organelle intracellular organelle organelle nucleus intracellular membrane-bounded organelle

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR011006	CheY-like superfamily	Homologous Superfamily
A	IPR003594	Histidine kinase/HSP90-like ATPase	Domain
A	IPR036890	Histidine kinase/HSP90-like ATPase superfamily	Homologous Superfamily
A	IPR003661	Signal transduction histidine kinase, dimerisation/phosphoacceptor domain	Domain
A	IPR004358	Signal transduction histidine kinase-related protein, C-terminal	Domain
A	IPR001789	Signal transduction response regulator, receiver domain	Domain
A	IPR036097	Signal transduction histidine kinase, dimerisation/phosphoacceptor domain superfamily	Homologous Superfamily
A	IPR035965	PAS domain superfamily	Homologous Superfamily
A	IPR005467	Histidine kinase domain	Domain
B	IPR045871	Histidine-containing phosphotransfer protein 1-5/Phosphorelay intermediate protein YPD1	Family
B	IPR036641	HPT domain superfamily	Homologous Superfamily
B	IPR008207	Signal transduction histidine kinase, phosphotransfer (Hpt) 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.