Annotations: 4QPK

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	PTR2	e4qpkB1	A: a/b three-layered sandwiches	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: PTR2	ECOD (v294.1)
A	PTR2	e4qpkA1	A: a/b three-layered sandwiches	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: PTR2	ECOD (v294.1)

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	1.10.287.130	Mainly Alpha	Orthogonal Bundle	Helix Hairpins	Signal transduction histidine kinase, dimerisation/phosphotransfer (DHp) domain	CATH (4.3.0)
B	3.30.565.10	Alpha Beta	2-Layer Sandwich	Heat Shock Protein 90	Histidine kinase-like ATPase, C-terminal domain	CATH (4.3.0)
A	1.10.287.130	Mainly Alpha	Orthogonal Bundle	Helix Hairpins	Signal transduction histidine kinase, dimerisation/phosphotransfer (DHp) domain	CATH (4.3.0)
A	3.30.565.10	Alpha Beta	2-Layer Sandwich	Heat Shock Protein 90	Histidine kinase-like ATPase, C-terminal domain	CATH (4.3.0)

Chains	Accession	Name	Description	Comments	Source
A, B	PF10090	Histidine phosphotransferase C-terminal domain (HPTransfase)	Histidine phosphotransferase C-terminal domain	HPTransfase is a family of essential histidine phosphotransferases. It controls the activity of the master bacterial cell-cycle regulator CtrA through phosphorylation. It behaves as a homodimer by adopting the domain architecture of the intracellula ...	HPTransfase is a family of essential histidine phosphotransferases. It controls the activity of the master bacterial cell-cycle regulator CtrA through phosphorylation. It behaves as a homodimer by adopting the domain architecture of the intracellular part of class I histidine kinases. Each subunit consists of two distinct domains: an N-terminal helical hairpin domain and a C-terminal [alpha]/[beta] domain. The two N-terminal domains are adjacent within the dimer, forming a four-helix bundle. The C-terminal domain adopts an atypical Bergerat ATP-binding fold [1].	Domain

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	PHOSPHOTRANSFERASE	identical protein binding protein binding binding protein homodimerization activity protein dimerization activity catalytic activity, acting on a protein kinase activity protein kinase activity transferase activity catalytic activity phosphotransferase activity, alcohol group as acceptor transferase activity, transferring phosphorus-containing groups	macromolecule modification peptidyl-amino acid modification metabolic process cellular process primary metabolic process peptidyl-aspartic acid modification protein metabolic process macromolecule metabolic process protein modification process cellular response to stimulus regulation of biological process phosphorelay signal transduction system regulation of cellular process response to stimulus macromolecule modification peptidyl-amino acid modification metabolic process cellular process primary metabolic process peptidyl-aspartic acid modification protein metabolic process macromolecule metabolic process protein modification process cellular response to stimulus regulation of biological process phosphorelay signal transduction system regulation of cellular process response to stimulus signaling biological regulation intracellular signal transduction cell communication signal transduction	cellular anatomical structure intracellular anatomical structure cytoplasm