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Information on EC 3.6.5.2 - small monomeric GTPase

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EC Tree
IUBMB Comments
A family of about 50 enzymes with a molecular mass of 21 kDa that are distantly related to the alpha-subunit of heterotrimeric G-protein GTPase (EC 3.6.5.1). They are involved in cell-growth regulation (Ras subfamily), membrane vesicle traffic and uncoating (Rab and ARF subfamilies), nuclear protein import (Ran subfamily) and organization of the cytoskeleton (Rho and Rac subfamilies).
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This record set is specific for:
UNIPROT: P62745
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Word Map
The enzyme appears in viruses and cellular organisms
Synonyms
k-ras, cdc42, h-ras, small gtpase, ef-tu, rho gtpase, rab11, rab3a, rab27a, rap1a, more
SYNONYM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
RhoGTPase
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small GTPase
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GTP-phosphohydrolase
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GTPase
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guanine triphosphatase
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guanosine 5'-triphosphatase
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guanosine triphosphatase
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ribosomal GTPase
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REACTION TYPE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
phosphorous acid anhydride hydrolysis
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SYSTEMATIC NAME
IUBMB Comments
GTP phosphohydrolase (cell-regulating)
A family of about 50 enzymes with a molecular mass of 21 kDa that are distantly related to the alpha-subunit of heterotrimeric G-protein GTPase (EC 3.6.5.1). They are involved in cell-growth regulation (Ras subfamily), membrane vesicle traffic and uncoating (Rab and ARF subfamilies), nuclear protein import (Ran subfamily) and organization of the cytoskeleton (Rho and Rac subfamilies).
CAS REGISTRY NUMBER
COMMENTARY hide
9059-32-9
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SUBSTRATE
PRODUCT                       
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
Reversibility
r=reversible
ir=irreversible
?=not specified
GTP + H2O
GDP + phosphate
show the reaction diagram
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?
NATURAL SUBSTRATE
NATURAL PRODUCT
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
REVERSIBILITY
r=reversible
ir=irreversible
?=not specified
GTP + H2O
GDP + phosphate
show the reaction diagram
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?
INHIBITOR
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
additional information
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ACTIVATING COMPOUND
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
cytotoxic necrotizing factor 1
activation of Rho proteins by the cytotoxic necrotizing factor 1 (CNF1) from Escherichia coli, while the isomeric cytotoxicnecrotizing factor from Yersinia pseudotuberculosis (CNFy) drives GTP-loading of basal RhoB but fails tocause activation of the rhoB promoter and thus its expression. CNF1 inhibits cytokinesis and induces the formation of bi-nucleated (tetraploid) cells. Cytotoxic-necrotizing factors encompass a class of auto-transporter toxins produced by Escherichia coli (CNF1-3) or Yersiniapseudotuberculosis (CNFy). CNF1 deamidates Gln63 in RhoA. CNF1-induced RhoB response depends on the deamidation of Rho proteins
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ORGANISM
COMMENTARY hide
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
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UniProt
Manually annotated by BRENDA team
GENERAL INFORMATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
physiological function
additional information
UNIPROT
ENTRY NAME
ORGANISM
NO. OF AA
NO. OF TRANSM. HELICES
MOLECULAR WEIGHT[Da]
SOURCE
SEQUENCE
LOCALIZATION PREDICTION?
RHOB_HUMAN
196
0
22123
Swiss-Prot
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SUBUNIT
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
additional information
POSTTRANSLATIONAL MODIFICATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
lipoprotein
the C-terminus of RhoGTPases comprises, next to the hypervariable region, the CAAX-box to which a lipid anchor is attached allowing GTPase binding to membranes. RhoA, RhoB and RhoC differ in this posttranslational lipid modification which has consequences for their subcellular localization. The lipid anchor regulates the interaction with RhoGDIs and with regions within the plasma membrane (RhoA, RhoC) or endosomal vesicles (RhoB). RhoA and RhoC are geranylgeranylated, whereas RhoB has both a palmitoyl anchor and a farnesyl or geranylgeranyl group
CLONED (Commentary)
ORGANISM
UNIPROT
LITERATURE
analysis of rhoB mRNA level by semi-quantitative real-time RT-PCR
EXPRESSION
ORGANISM
UNIPROT
LITERATURE
RhoB is the only member of the Rho subfamily of small GTPases, which is classified as an immediate early gene product. RhoB is up-regulated in response to growth factors as well as cytotoxic and genotoxic agents. Clostridial glucosylating toxins evoke pronounced RhoB expression, based on the inactivation of Rho/Ras proteins. Long lasting expression of RhoB in cultured cells upon activation of Rho proteins by the cytotoxic necrotizing factor 1 (CNF1) from Escherichia coli. Deamidase-deficient CNF1-C866S fails to activate the rhoB promoter, CNF1-C866S only faintly induces expression of rhoB mRNA and RhoB protein. Critical role of Rac1 in CNF1-induced RhoB expression, overview
REF.
AUTHORS
TITLE
JOURNAL
VOL.
PAGES
YEAR
ORGANISM (UNIPROT)
PUBMED ID
SOURCE
Huelsenbeck, S.C.; Roggenkamp, D.; May, M.; Huelsenbeck, J.; Brakebusch, C.; Rottner, K.; Ladwein, M.; Just, I.; Fritz, G.; Schmidt, G.; Genth, H.
Expression and cytoprotective activity of the small GTPase RhoB induced by the Escherichia coli cytotoxic necrotizing factor 1
Int. J. Biochem. Cell Biol.
45
1767-1775
2013
Homo sapiens (P62745), Mus musculus (P62746), Mus musculus
Manually annotated by BRENDA team
Schaefer, A.; Reinhard, N.R.; Hordijk, P.L.
Toward understanding RhoGTPase specificity: structure, function and local activation
Small GTPases
5
6
2014
Homo sapiens (P08134), Homo sapiens (P61586), Homo sapiens (P62745)
Manually annotated by BRENDA team