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Information on EC 3.6.5.3 - protein-synthesizing GTPase

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EC Tree
IUBMB Comments
This enzyme comprises a family of proteins involved in prokaryotic as well as eukaryotic protein synthesis. In the initiation factor complex, it is IF-2b (98 kDa) that binds GTP and subsequently hydrolyses it in prokaryotes. In eukaryotes, it is eIF-2 (150 kDa) that binds GTP. In the elongation phase, the GTP-hydrolysing proteins are the EF-Tu polypeptide of the prokaryotic transfer factor (43 kDa), the eukaryotic elongation factor EF-1alpha (53 kDa), the prokaryotic EF-G (77 kDa), the eukaryotic EF-2 (70-110 kDa) and the signal recognition particle that play a role in endoplasmic reticulum protein synthesis (325 kDa). EF-Tu and EF-1alpha catalyse binding of aminoacyl-tRNA to the ribosomal A-site, while EF-G and EF-2 catalyse the translocation of peptidyl-tRNA from the A-site to the P-site. GTPase activity is also involved in polypeptide release from the ribosome with the aid of the pRFs and eRFs.
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UNIPROT: P60338
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Word Map
The enzyme appears in viruses and cellular organisms
Synonyms
elongation factor, translation initiation factor, gtpase-activating protein, eif2alpha, eif2b, elongation factor tu, eef1a, ef-1alpha, eukaryotic initiation factor 2, elongation factor g, more
SYNONYM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
elongation factor Tu
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elongation factor (EF)
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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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initiation factor (IF)
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peptide-release or termination factor
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ribosomal GTPase
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REACTION TYPE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
hydrolysis of phosphoric ester
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SYSTEMATIC NAME
IUBMB Comments
GTP phosphohydrolase (mRNA-translation-assisting)
This enzyme comprises a family of proteins involved in prokaryotic as well as eukaryotic protein synthesis. In the initiation factor complex, it is IF-2b (98 kDa) that binds GTP and subsequently hydrolyses it in prokaryotes. In eukaryotes, it is eIF-2 (150 kDa) that binds GTP. In the elongation phase, the GTP-hydrolysing proteins are the EF-Tu polypeptide of the prokaryotic transfer factor (43 kDa), the eukaryotic elongation factor EF-1alpha (53 kDa), the prokaryotic EF-G (77 kDa), the eukaryotic EF-2 (70-110 kDa) and the signal recognition particle that play a role in endoplasmic reticulum protein synthesis (325 kDa). EF-Tu and EF-1alpha catalyse binding of aminoacyl-tRNA to the ribosomal A-site, while EF-G and EF-2 catalyse the translocation of peptidyl-tRNA from the A-site to the P-site. GTPase activity is also involved in polypeptide release from the ribosome with the aid of the pRFs and eRFs.
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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?
ACTIVATING COMPOUND
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
additional information
active in GTP-bound form, inactive in GDP-bound form
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ORGANISM
COMMENTARY hide
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
UNIPROT
ENTRY NAME
ORGANISM
NO. OF AA
NO. OF TRANSM. HELICES
MOLECULAR WEIGHT[Da]
SOURCE
SEQUENCE
LOCALIZATION PREDICTION?
EFTU1_THETH
406
0
44782
Swiss-Prot
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CRYSTALLIZATION (Commentary)
ORGANISM
UNIPROT
LITERATURE
REF.
AUTHORS
TITLE
JOURNAL
VOL.
PAGES
YEAR
ORGANISM (UNIPROT)
PUBMED ID
SOURCE
Grigorenko, B.L.; Shadrina, M.S.; Topol, I.A.; Collins, J.R.; Nemukhin, A.V.
Mechanism of the chemical step for the guanosine triphosphate (GTP) hydrolysis catalyzed by elongation factor Tu
Biochim. Biophys. Acta
1784
1908-1917
2008
Thermus thermophilus (P60338), Thermus aquaticus (Q01698)
Manually annotated by BRENDA team