Annotations: 3T4T

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Sensory domain-like	8057003	3001802	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Sensory domain-like	8057003	3001802	SCOP2B (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	F_UNCLASSIFIED	e3t4tA2	A: a+b three layers	X: Profilin-like	H: sensor domains (From Topology)	T: sensor domains	F: F_UNCLASSIFIED	ECOD (1.6)
A	PF03924	e3t4tA1	A: a+b three layers	X: Profilin-like	H: sensor domains (From Topology)	T: sensor domains	F: PF03924	ECOD (1.6)
B	F_UNCLASSIFIED	e3t4tB2	A: a+b three layers	X: Profilin-like	H: sensor domains (From Topology)	T: sensor domains	F: F_UNCLASSIFIED	ECOD (1.6)
B	PF03924	e3t4tB1	A: a+b three layers	X: Profilin-like	H: sensor domains (From Topology)	T: sensor domains	F: PF03924	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	6.10.250.1190	Special	Helix non-globular	Single alpha-helices involved in coiled-coils or other helix-helix interfaces		CATH (4.3.0)
A	3.30.450.350	Alpha Beta	2-Layer Sandwich	Beta-Lactamase	CHASE domain	CATH (4.3.0)
B	6.10.250.1190	Special	Helix non-globular	Single alpha-helices involved in coiled-coils or other helix-helix interfaces		CATH (4.3.0)
B	3.30.450.350	Alpha Beta	2-Layer Sandwich	Beta-Lactamase	CHASE domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF03924	CHASE domain (CHASE)	CHASE domain	This domain is found in the extracellular portion of receptor-like proteins - such as serine/threonine kinases and adenylyl cyclases [1,2]. This is a ligand-binding domain that binds cytokinin (Matilla et.al., FEMS Microbiology Reviews, fuab043, 45, ...	This domain is found in the extracellular portion of receptor-like proteins - such as serine/threonine kinases and adenylyl cyclases [1,2]. This is a ligand-binding domain that binds cytokinin (Matilla et.al., FEMS Microbiology Reviews, fuab043, 45, 2021, 1. https://doi.org/10.1093/femsre/fuab043).	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Histidine kinase 4	phosphoric ester hydrolase activity phosphoprotein phosphatase activity catalytic activity, acting on a protein hydrolase activity, acting on ester bonds phosphatase activity hydrolase activity catalytic activity cytokinin receptor activity molecular transducer activity kinase activity protein kinase activity signaling receptor activity transferase activity phosphotransferase activity, nitrogenous group as acceptor phosphoric ester hydrolase activity phosphoprotein phosphatase activity catalytic activity, acting on a protein hydrolase activity, acting on ester bonds phosphatase activity hydrolase activity catalytic activity cytokinin receptor activity molecular transducer activity kinase activity protein kinase activity signaling receptor activity transferase activity phosphotransferase activity, nitrogenous group as acceptor transmembrane histidine kinase cytokinin receptor activity phosphotransferase activity, alcohol group as acceptor transferase activity, transferring phosphorus-containing groups protein histidine kinase activity transmembrane receptor histidine kinase activity transmembrane signaling receptor activity transmembrane receptor protein kinase activity small molecule sensor activity phosphorelay sensor kinase activity protein serine/threonine phosphatase activity myosin phosphatase activity protein binding binding kinase binding enzyme binding protein kinase binding protein histidine kinase binding	response to acid chemical response to stimulus response to stress response to chemical response to oxygen-containing compound response to abiotic stimulus response to water response to water deprivation response to inorganic substance developmental process regulation of biological process meristem development regulation of meristem development regulation of developmental process response to acid chemical response to stimulus response to stress response to chemical response to oxygen-containing compound response to abiotic stimulus response to water response to water deprivation response to inorganic substance developmental process regulation of biological process meristem development regulation of meristem development regulation of developmental process biological regulation anatomical structure development tissue development multicellular organism development multicellular organismal process regulation of shoot system development shoot system development system development cellular response to stimulus response to organic substance regulation of cellular process signaling response to endogenous stimulus 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 process cellular response to organic substance signal transduction cellular response to hormone stimulus biological process involved in interspecies interaction between organisms response to other organism defense response response to external stimulus response to biotic stimulus defense response to bacterium defense response to other organism response to bacterium response to external biotic stimulus localization sulfate transport transport sulfur compound transport establishment of localization inorganic anion transport chemical homeostasis homeostatic process carbohydrate homeostasis regulation of multicellular organismal development regulation of seedling development seed germination seedling development regulation of post-embryonic development regulation of seed germination post-embryonic development regulation of multicellular organismal process response to osmotic stress cellular response to chemical stress cellular response to osmotic stress intracellular signal transduction cellular response to environmental stimulus osmosensory signaling pathway cellular response to stress cellular response to abiotic stimulus phosphorelay signal transduction system protein phosphorylation organonitrogen compound metabolic process phosphorylation cellular metabolic process primary metabolic process organic substance metabolic process macromolecule modification phosphate-containing compound metabolic process metabolic process protein metabolic process macromolecule metabolic process protein modification process phosphorus metabolic process response to disaccharide cellular response to oxygen-containing compound cellular response to sucrose stimulus cellular response to carbohydrate stimulus response to carbohydrate response to sucrose cellular response to disaccharide stimulus plant organ development root morphogenesis embryonic morphogenesis embryonic root morphogenesis embryo development plant organ morphogenesis anatomical structure morphogenesis root development root system development cellular response to nutrient levels response to nutrient levels cellular response to phosphate starvation response to starvation cellular response to starvation	cell periphery plasma membrane membrane cellular anatomical entity membrane-bounded organelle intracellular anatomical structure organelle subcompartment intracellular membrane-bounded organelle endomembrane system endoplasmic reticulum subcompartment intracellular organelle organelle nuclear outer membrane-endoplasmic reticulum membrane network endoplasmic reticulum cell periphery plasma membrane membrane cellular anatomical entity membrane-bounded organelle intracellular anatomical structure organelle subcompartment intracellular membrane-bounded organelle endomembrane system endoplasmic reticulum subcompartment intracellular organelle organelle nuclear outer membrane-endoplasmic reticulum membrane network endoplasmic reticulum cytoplasm organelle membrane endoplasmic reticulum membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR011006	CheY-like superfamily	Homologous Superfamily
A, B	IPR003594	Histidine kinase/HSP90-like ATPase	Domain
A, B	IPR000836	Phosphoribosyltransferase domain	Domain
A, B	IPR036890	Histidine kinase/HSP90-like ATPase superfamily	Homologous Superfamily
A, B	IPR003661	Signal transduction histidine kinase, dimerisation/phosphoacceptor domain	Domain
A, B	IPR004358	Signal transduction histidine kinase-related protein, C-terminal	Domain
A, B	IPR001789	Signal transduction response regulator, receiver domain	Domain
A, B	IPR036097	Signal transduction histidine kinase, dimerisation/phosphoacceptor domain superfamily	Homologous Superfamily
A, B	IPR042240	CHASE domain superfamily	Homologous Superfamily
A, B	IPR005467	Histidine kinase domain	Domain
A, B	IPR006189	CHASE 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.