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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: Q9UL25
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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
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
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
Rab21 has a role in the dynamics of the early endocytic pathway
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ORGANISM
COMMENTARY hide
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
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SwissProt
Manually annotated by BRENDA team
SOURCE TISSUE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
SOURCE
LOCALIZATION
ORGANISM
UNIPROT
COMMENTARY hide
GeneOntology No.
LITERATURE
SOURCE
Rab21 is predominantly localized to the early endocytic pathway, on vesicles containing early-endosomal antigen 1, transferrin receptor and internalized ligands
Manually annotated by BRENDA team
additional information
UNIPROT
ENTRY NAME
ORGANISM
NO. OF AA
NO. OF TRANSM. HELICES
MOLECULAR WEIGHT[Da]
SOURCE
SEQUENCE
LOCALIZATION PREDICTION?
RAB21_HUMAN
225
0
24348
Swiss-Prot
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MOLECULAR WEIGHT
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
51000
x * 51000, GFP-Rab21, SDS-PAGE
SUBUNIT
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
?
x * 51000, GFP-Rab21, SDS-PAGE
PROTEIN VARIANTS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
Q78L
mutant is defective in GTP hydrolysis, subcellular distribution
T33N
mutant enzyme is defective in GTP binding, cells expressing mutant Rab21 show defects in endocytosis of transferrin and epidermal growth factor and fail to effectively deliver the latter ligand to late endosomes and lysosomes for degradation, subcellular distribution
CLONED (Commentary)
ORGANISM
UNIPROT
LITERATURE
Rab21 cDNA from K-562 cell, expression in HeLa cells CCL-2 and in hepatocellular carcinoma Hep3B cells
REF.
AUTHORS
TITLE
JOURNAL
VOL.
PAGES
YEAR
ORGANISM (UNIPROT)
PUBMED ID
SOURCE
Simpson, J.C.; Griffiths, G.; Wessling-Resnick, M.; Fransen, J.A.; Bennett, H.; Jones, A.T.
A role for the small GTPase Rab21 in the early endocytic pathway
J. Cell Sci.
117
6297-6311
2004
Homo sapiens (Q9UL25), Homo sapiens
Manually annotated by BRENDA team