Annotations: 1YAX

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
D	PhoQ_Sensor	e1yaxD1	A: a+b three layers	X: Profilin-like	H: sensor domains (From Topology)	T: sensor domains	F: PhoQ_Sensor	ECOD (1.6)
C	PhoQ_Sensor	e1yaxC1	A: a+b three layers	X: Profilin-like	H: sensor domains (From Topology)	T: sensor domains	F: PhoQ_Sensor	ECOD (1.6)
B	PhoQ_Sensor	e1yaxB1	A: a+b three layers	X: Profilin-like	H: sensor domains (From Topology)	T: sensor domains	F: PhoQ_Sensor	ECOD (1.6)
A	PhoQ_Sensor	e1yaxA1	A: a+b three layers	X: Profilin-like	H: sensor domains (From Topology)	T: sensor domains	F: PhoQ_Sensor	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
D	3.30.450.140	Alpha Beta	2-Layer Sandwich	Beta-Lactamase	PhoQ sensor domain	CATH (4.3.0)
C	3.30.450.140	Alpha Beta	2-Layer Sandwich	Beta-Lactamase	PhoQ sensor domain	CATH (4.3.0)
B	3.30.450.140	Alpha Beta	2-Layer Sandwich	Beta-Lactamase	PhoQ sensor domain	CATH (4.3.0)
A	3.30.450.140	Alpha Beta	2-Layer Sandwich	Beta-Lactamase	PhoQ sensor domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D	PF08918	PhoQ Sensor (PhoQ_Sensor)	PhoQ Sensor	The PhoQ Sensor is required for the virulence of various Gram-negative bacteria by allowing interaction of PhoPQ with the intracellular membrane, resulting in remodelling of the bacterial cell surface and subsequent bacterial resistance to host antim ...	The PhoQ Sensor is required for the virulence of various Gram-negative bacteria by allowing interaction of PhoPQ with the intracellular membrane, resulting in remodelling of the bacterial cell surface and subsequent bacterial resistance to host antimicrobial peptides. The domain contains a major flat acidic surface, which binds to at least 3 calcium ions, neutralising the domain's negative charge and allowing interaction with the negatively charged membrane [1]. This domain recognises divalent metal cations, and antimicrobial cationic peptides (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, C, D	Virulence sensor protein phoQ, sensor domain	binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding 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 molecular 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 molecular function regulator activity cation binding metal ion binding	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 cellular process signal transduction	cell periphery cellular anatomical structure plasma membrane membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D	IPR004358	Signal transduction histidine kinase-related protein, C-terminal	Domain
A, B, C, D	IPR036097	Signal transduction histidine kinase, dimerisation/phosphoacceptor domain superfamily	Homologous Superfamily
A, B, C, D	IPR003660	HAMP domain	Domain
A, B, C, D	IPR036890	Histidine kinase/HSP90-like ATPase superfamily	Homologous Superfamily
A, B, C, D	IPR005467	Histidine kinase domain	Domain
A, B, C, D	IPR038429	PhoQ Sensor superfamily	Homologous Superfamily
A, B, C, D	IPR015014	PhoQ Sensor domain	Domain
A, B, C, D	IPR050428	Two-component system sensor histidine kinase	Family

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.