3RRK

Crystal structure of the cytoplasmic N-terminal domain of subunit I, homolog of subunit a, of V-ATPase

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PRK05771_like_2nd	e3rrkA3	A: alpha bundles	X: helical bundle domain in vacuolar ATP synthase subunit C (From Topology)	H: helical bundle domain in vacuolar ATP synthase subunit C (From Topology)	T: helical bundle domain in vacuolar ATP synthase subunit C	F: PRK05771_like_2nd	ECOD (1.6)
A	EUF08374	e3rrkA2	A: a+b two layers	X: Alpha-beta plaits	H: ferredoxin-like domain in vacuolar ATP synthase subunit C (From Topology)	T: ferredoxin-like domain in vacuolar ATP synthase subunit C	F: EUF08374	ECOD (1.6)
A	PRK05771_like_1st	e3rrkA1	A: a+b two layers	X: Alpha-beta plaits	H: ferredoxin-like domain in vacuolar ATP synthase subunit C (From Topology)	T: ferredoxin-like domain in vacuolar ATP synthase subunit C	F: PRK05771_like_1st	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.30.70.2170	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits		CATH (4.3.0)
A	1.20.1460.20	Mainly Alpha	Up-down Bundle	subunit c (vma5p) of the yeast v-atpase, domain 2		CATH (4.3.0)
A	3.30.70.2750	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits		CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF18274	Vacuolar ATPase Subunit I N-terminal proximal lobe (V_ATPase_prox)	Vacuolar ATPase Subunit I N-terminal proximal lobe	This domain is found in the cytoplasmic N-terminal domain of vacuolar ATP synthase subunit I present in Meiothermus ruber. Subunit I is a homolog of subunit A which associates with the membrane-bound complex of eukaryotic vacuolar H+-ATPase (V-ATPase ...	This domain is found in the cytoplasmic N-terminal domain of vacuolar ATP synthase subunit I present in Meiothermus ruber. Subunit I is a homolog of subunit A which associates with the membrane-bound complex of eukaryotic vacuolar H+-ATPase (V-ATPase) acidification machinery. The domain forms the proximal lobe that caps one end of the alpha helix bundle, with the distal lobe capping the other end. Although the two lobes exhibit a similar motif, the molecular nature of the coupling with the identical stalks is thought to be dissimilar [1].	Domain
A	PF18670	V-type ATPase subunit I, N-terminal domain (V_ATPase_I_N)	V-type ATPase subunit I, N-terminal domain	Vacuolar H+-ATPase (V-ATPase) is a ubiquitous multi-subunit proton pump that acidifies a wide variety of intracellular compartments, which in turn affects many biological processes, including membrane trafficking, protein degradation and coupled tran ...	Vacuolar H+-ATPase (V-ATPase) is a ubiquitous multi-subunit proton pump that acidifies a wide variety of intracellular compartments, which in turn affects many biological processes, including membrane trafficking, protein degradation and coupled transport of small molecules and pH homeostasis. Subunit 'a' of V0 (the functional domain responsible for proton transport) sector is highly conserved across eukaryotic species and exists in multiple isoforms. It is the largest subunit of V-ATPases and partitioned almost equally into an N-terminal cytosolic domain and a C-terminal integral membrane. Structure analysis of the N-terminal cytosolic domain from the Meiothermus ruber subunit 'I' homolog of subunit a shows that it is composed of a curved long central alpha-helix bundle capped on both ends by two lobes with similar alpha/beta architecture [1].	Domain
A	PF01496	V-type ATPase 116kDa subunit family (V_ATPase_I)	V-type ATPase 116kDa subunit family	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	V-type ATPase 116 kDa subunit	monoatomic cation transmembrane transporter activity proton transmembrane transporter activity primary active transmembrane transporter activity ATPase-coupled transmembrane transporter activity proton-transporting ATPase activity, rotational mechanism ATPase-coupled monoatomic cation transmembrane transporter activity ATP-dependent activity active monoatomic ion transmembrane transporter activity ATPase-coupled ion transmembrane transporter activity active transmembrane transporter activity ATPase activity, coupled to transmembrane movement of ions, rotational mechanism inorganic molecular entity transmembrane transporter activity inorganic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity transporter activity monoatomic cation transmembrane transporter activity proton transmembrane transporter activity primary active transmembrane transporter activity ATPase-coupled transmembrane transporter activity proton-transporting ATPase activity, rotational mechanism ATPase-coupled monoatomic cation transmembrane transporter activity ATP-dependent activity active monoatomic ion transmembrane transporter activity ATPase-coupled ion transmembrane transporter activity active transmembrane transporter activity ATPase activity, coupled to transmembrane movement of ions, rotational mechanism inorganic molecular entity transmembrane transporter activity inorganic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter activity ATPase binding protein binding binding enzyme binding	homeostatic process biological regulation intracellular pH reduction regulation of intracellular pH vacuolar acidification cellular homeostasis chemical homeostasis intracellular monoatomic cation homeostasis regulation of pH monoatomic ion homeostasis intracellular chemical homeostasis regulation of biological quality monoatomic cation homeostasis regulation of cellular pH homeostatic process biological regulation intracellular pH reduction regulation of intracellular pH vacuolar acidification cellular homeostasis chemical homeostasis intracellular monoatomic cation homeostasis regulation of pH monoatomic ion homeostasis intracellular chemical homeostasis regulation of biological quality monoatomic cation homeostasis regulation of cellular pH intracellular monoatomic ion homeostasis	ATPase dependent transmembrane transport complex protein-containing complex ATPase complex catalytic complex membrane membrane protein complex proton-transporting V-type ATPase complex transporter complex proton-transporting two-sector ATPase complex, proton-transporting domain cation-transporting ATPase complex cellular anatomical structure proton-transporting two-sector ATPase complex transmembrane transporter complex proton-transporting V-type ATPase, V0 domain ATPase dependent transmembrane transport complex protein-containing complex ATPase complex catalytic complex membrane membrane protein complex proton-transporting V-type ATPase complex transporter complex proton-transporting two-sector ATPase complex, proton-transporting domain cation-transporting ATPase complex cellular anatomical structure proton-transporting two-sector ATPase complex transmembrane transporter complex proton-transporting V-type ATPase, V0 domain membrane-bounded organelle intracellular anatomical structure intracellular organelle bounding membrane of organelle vacuolar membrane vacuole intracellular membrane-bounded organelle vacuolar proton-transporting V-type ATPase complex organelle cytoplasm organelle membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR040574	V-type ATP synthase subunit I, N-terminal	Domain
A	IPR002490	V-type ATPase, V0 complex, 116kDa subunit family	Family
A	IPR041276	Vacuolar ATPase subunit I, N-terminal proximal lobe	Domain

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.