Annotations: 5CA9

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	GBP, RHD3_GTPase	e5ca9A1	A: a/b three-layered sandwiches	X: Cysteine proteinases-like	H: Cysteine proteinases	T: Cysteine proteinases	F: GBP, RHD3_GTPase	ECOD (v294.1)
A	Sey1_3HB	e5ca9A2	A: a/b three-layered sandwiches	X: Cysteine proteinases-like	H: Cysteine proteinases	T: Cysteine proteinases	F: Sey1_3HB	ECOD (v294.1)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF20428	Sey1 three-helix bundle domain (Sey1_3HB)	Sey1 three-helix bundle domain	This is the three-helix bundle (3HB) domain found at the C-terminal of Sey1 from yeast and RHD3 from Arabidopsis, GTP-binding proteins involved in homotypic membrane fusion of the endoplasmic reticulum [1,2,3]. This is a stalk-like domain composed of ...	This is the three-helix bundle (3HB) domain found at the C-terminal of Sey1 from yeast and RHD3 from Arabidopsis, GTP-binding proteins involved in homotypic membrane fusion of the endoplasmic reticulum [1,2,3]. This is a stalk-like domain composed of four 3HBs that interacts with its own GTPase domain and that of a neighbouring molecule, to undergo major conformational changes during the GTP cycle to drive membrane fusion [3].	Domain
A	PF05879	Root hair defective 3 GTP-binding protein (RHD3) GTPase domain (RHD3_GTPase)	Root hair defective 3 GTP-binding protein (RHD3) GTPase domain	This is the GTPase domain of several eukaryotic root hair defective 3 (RHD3) like GTP-binding proteins, including RHD3 from Arabidopsis and Sey1 from yeast [1,2,3], which are involved in homotypic membrane fusion of the endoplasmic reticulum [3]. Thi ...	This is the GTPase domain of several eukaryotic root hair defective 3 (RHD3) like GTP-binding proteins, including RHD3 from Arabidopsis and Sey1 from yeast [1,2,3], which are involved in homotypic membrane fusion of the endoplasmic reticulum [3]. This domain binds GTP and forms dimers with other molecule for membrane tethering [3].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Protein SEY1	binding guanyl nucleotide binding GTP binding nucleotide binding guanyl ribonucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding binding guanyl nucleotide binding GTP binding nucleotide binding guanyl ribonucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding pyrophosphatase activity GTPase activity ribonucleoside triphosphate phosphatase activity hydrolase activity, acting on acid anhydrides, in phosphorus-containing anhydrides hydrolase activity hydrolase activity, acting on acid anhydrides catalytic activity	cellular component organization organelle organization organelle inheritance cellular process cellular component organization or biogenesis endoplasmic reticulum inheritance endoplasmic reticulum organization endomembrane system organization transmembrane transport localization hexose transmembrane transport transport carbohydrate transport monosaccharide transmembrane transport cellular component organization organelle organization organelle inheritance cellular process cellular component organization or biogenesis endoplasmic reticulum inheritance endoplasmic reticulum organization endomembrane system organization transmembrane transport localization hexose transmembrane transport transport carbohydrate transport monosaccharide transmembrane transport carbohydrate transmembrane transport establishment of localization membrane organization membrane fusion organelle membrane fusion organelle fusion endoplasmic reticulum membrane organization endoplasmic reticulum membrane fusion cellular response to stimulus cellular response to chemical stimulus response to stimulus response to chemical cellular response to xenobiotic stimulus response to xenobiotic stimulus	membrane-bounded organelle cell cortex intracellular anatomical structure cortical endoplasmic reticulum organelle subcompartment intracellular membrane-bounded organelle endomembrane system cell periphery endoplasmic reticulum subcompartment intracellular organelle cellular anatomical structure organelle endoplasmic reticulum cytoplasm membrane-bounded organelle cell cortex intracellular anatomical structure cortical endoplasmic reticulum organelle subcompartment intracellular membrane-bounded organelle endomembrane system cell periphery endoplasmic reticulum subcompartment intracellular organelle cellular anatomical structure organelle endoplasmic reticulum cytoplasm endoplasmic reticulum tubular network membrane nuclear outer membrane-endoplasmic reticulum membrane network organelle membrane endoplasmic reticulum membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR008803	RHD3/Sey1	Family
A	IPR030386	GB1/RHD3-type guanine nucleotide-binding (G) domain	Domain
A	IPR046758	Sey1/RHD3-like, three-helix bundle domain	Domain
A	IPR027417	P-loop containing nucleoside triphosphate hydrolase	Homologous Superfamily

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. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.