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Information on EC 3.6.5.1 - heterotrimeric G-protein GTPase and Organism(s) Homo sapiens

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IUBMB Comments
This group comprises GTP-hydrolysing systems, where GTP and GDP alternate in binding. This group includes stimulatory and inhibitory G-proteins such as Gs, Gi, Go and Golf, targetting adenylate cyclase and/or K+ and Ca2+ channels; Gq stimulating phospholipase C; transducin activating cGMP phosphodiesterase; gustducin activating cAMP phosphodiesterase. Golf is instrumental in odour perception, transducin in vision and gustducin in taste recognition. At least 16 different alpha subunits (39-52 kDa), 5 beta subunits (36 kDa) and 12 gamma subunits (6-9 kDa) are known.
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Homo sapiens
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Word Map
The taxonomic range for the selected organisms is: Homo sapiens
The expected taxonomic range for this enzyme is: Eukaryota, Bacteria, Archaea
Reaction Schemes
Synonyms
gtpase, transducin, gs alpha, heterotrimeric g protein, galphaq, guanosine triphosphatase, elongation factor 2, heterotrimeric g-protein, rab1a, g alpha q, more
SYNONYM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
cone transducin
-
-
G alpha i2
-
-
G betagamma
-
-
Galphai1
-
-
Galphai3
-
-
Galphaq
-
-
GTP phosphohydrolase
GTPase
-
-
-
-
guanosine 5'-triphosphatase
-
-
-
-
guanosine triphosphatase
-
-
-
-
heterotrimeric G protein
-
-
heterotrimeric G protein family
-
-
heterotrimeric G-protein
-
-
heterotrimeric G-protein GTPase
-
-
phosphatase, guanosine tri-
-
-
-
-
ribosomal GTPase
-
-
-
-
transducin
-
-
transducin GTPase
-
-
-
-
REACTION TYPE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
hydrolysis
-
-
phosphorous acid anhydride hydrolysis
SYSTEMATIC NAME
IUBMB Comments
GTP phosphohydrolase (signalling)
This group comprises GTP-hydrolysing systems, where GTP and GDP alternate in binding. This group includes stimulatory and inhibitory G-proteins such as Gs, Gi, Go and Golf, targetting adenylate cyclase and/or K+ and Ca2+ channels; Gq stimulating phospholipase C; transducin activating cGMP phosphodiesterase; gustducin activating cAMP phosphodiesterase. Golf is instrumental in odour perception, transducin in vision and gustducin in taste recognition. At least 16 different alpha subunits (39-52 kDa), 5 beta subunits (36 kDa) and 12 gamma subunits (6-9 kDa) are known.
CAS REGISTRY NUMBER
COMMENTARY hide
9059-32-9
-
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
additional information
?
-
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
additional information
?
-
-
Galpha12 and Galpha13 couple with G-protein coupled receptors, GPCRs, for various ligands, e.g. angiotensin II, endothelin, thrombin, bombesin, thromboxane A2, sphingosine-1-phosphate, and lysophosphatidic acid. The coupling specificity between G12 and G13 is usually not strict and most of these ligands can activate both G12 and G13. The RH domain of PDZ-RhoGEF interacts with Galpha13 through multiple intermolecular interfaces. One point of contact is centred on an Ile-Ile-Gly motif found N-terminal to the RGS box. This motif forms multiple contacts with the alpha helical domain of Galpha13, and is conserved in other RH-RhoGEFs. Additionally, Galpha13 interacts with an acidic stretch of residues N-terminal to the core RGS box of PDZ-RhoGEF, overview
-
-
?
METALS and IONS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
Mg2+
-
required
INHIBITOR
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
Pasteurella multocida toxin
-
deamidates glutamine-205 of G alphaI2 to glutamic acid, inhibits intrinsic GTPase activity, causes persistent activation of the G protein
-
additional information
-
tubulin binds to Gs alpha, Gi alpha1 and Gq alpha, destabilize microtubules
-
ACTIVATING COMPOUND
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
Axin protein
-
member of RA or E subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
Axin2 protein
-
member of RA or E subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
D-AKAP2 protein
-
-
-
gamma-subunit of cGMP phosphodiesterase
-
accelerate GTP hydrolysis by transducin
-
GRK1 protein
-
member of GRK or G subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
GRK2 protein
-
member of GRK or G subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
GRK3 protein
-
member of GRK or G subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
GRK4 protein
-
member of GRK or G subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
GRK5 protein
-
member of GRK or G subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
GRK6 protein
-
member of GRK or G subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
GRK7 protein
-
member of GRK or G subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
LARG protein
-
member of GEF or F subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
p115-RhoGEF protein
-
member of GEF or F subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
Pasteurella multocida toxin
-
-
-
PDZ-RhoGEF protein
-
member of GEF or F subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
RGS
-
retinal specific member of the RGS family accelerates GTP hydrolysis by transducin
RGS1 protein
-
human B-lymphocyte, member of R4 or B subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
RGS10 protein
-
member of R12 or D subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
RGS11 protein
-
member of R7 or C subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
RGS12 protein
-
member of R12 or D subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
RGS13 protein
-
member of R4 or B subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
RGS14 protein
-
RGS16 protein
-
RGS17 protein
-
member of RZ or A subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
RGS18 protein
-
member of R4 or B subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
RGS19 protein
-
member of RZ or A subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
RGS2 protein
-
human T-lymphocyte, member of R4 or B subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
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RGS20 protein
-
member of RZ or A subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
RGS21 protein
-
member of R4 or B subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
RGS22 protein
-
-
-
RGS3 protein
-
member of R4 or B subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
RGS4 protein
-
member of R4 or B subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
RGS5 protein
-
member of R4 or B subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
RGS6 protein
-
member of R7 or C subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
RGS7 protein
-
member of R7 or C subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
RGS8 protein
-
member of R4 or B subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
RGS9 protein
-
member of R7 or C subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
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RGS9d protein
-
-
-
SNX13 protein
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member of SNX or H subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
-
SNX14 protein
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member of SNX or H subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
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SNX25 protein
-
member of SNX or H subfamily of RGS protein superfamily, RGS: regulator of G-protein signaling
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unidentified membrane factor
-
accelerate GTP hydrolysis by transducin
-
additional information
-
KM VALUE [mM]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
0.1 - 0.85
GTP
pH OPTIMUM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
7.5
-
assay at
TEMPERATURE OPTIMUM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
30
-
assay at
ORGANISM
COMMENTARY hide
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
SOURCE TISSUE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
SOURCE
-
Go-alpha subunit
Manually annotated by BRENDA team
-
Jurkat leukemic T lymphocyte cell line, clone E6-1
Manually annotated by BRENDA team
-
outer rod segment
Manually annotated by BRENDA team
additional information
LOCALIZATION
ORGANISM
UNIPROT
COMMENTARY hide
GeneOntology No.
LITERATURE
SOURCE
-
outer rod segment membrane
Manually annotated by BRENDA team
GENERAL INFORMATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
evolution
-
Galpha subunits are classified into four subfamilies, Gs, Gi, Gq and G12. Galpha12/13 and Galphaq are directly involved in the activation of RhoGTPases, molecular mechanisms for regulation of RhoGTPase activity through GPCR heterotrimeric G12/13-signalling pathways, overview. The G12/13-RH-RhoGEF signalling mechanism is well conserved over species
malfunction
-
overexpression of constitutively active Galpha12 or 13 induces several cellular effects which suggest stimulation of Rho activity in cells, such as formation of actin stress fibres or neurite retraction in neuronal cells. NIH3T3 transforming activity of constitutively active mutant of Galpha12 can be prevented by blocking its palmitoylation
metabolism
-
Rho guanine nucleotide exchange factor p63RhoGEF619 relocates to the plasma membrane upon activation of Galphaq coupled GPCRs, resembling the well-known activation mechanism of Rho guanine nucleotide exchange factors (RhoGEFs) activated by Galpha12/13. Synthetic recruitment of p63RhoGEF619 to the plasma membrane increases RhoGEF activity towards GTPase RhoA, but full activation requires allosteric activation via Galphaq, overview. Dual role for heterotrimeric G-protein Galphaq in RhoGEF activation, as it both recruits and allosterically activates cytosolic ARHGEF25 gene encoding three RhoGEF isoforms. Activation of the heterotrimeric G-protein Galphaq relieves the DH domain of p63RhoGEF from its autoinhibited state by allosteric interaction with the PH domain
physiological function
additional information
-
Gbetagamma interacts with the N-terminal alpha helix of Galpha through one of the seven bladed propellers of the Gbeta subunit
UNIPROT
ENTRY NAME
ORGANISM
NO. OF AA
NO. OF TRANSM. HELICES
MOLECULAR WEIGHT[Da]
SOURCE
SEQUENCE
LOCALIZATION PREDICTION?
GNA15_HUMAN
374
0
43568
Swiss-Prot
-
GNAI1_HUMAN
354
0
40361
Swiss-Prot
-
SUBUNIT
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
heterotrimer
additional information
POSTTRANSLATIONAL MODIFICATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
lipoprotein
-
both Galpha12 and 13 are subjected to palmitoylation at cysteine residues near their N-terminus, palmitoylation of Galpha13 is required for its association with the plasma membrane and its ability to activate RhoA through p115RhoGEF. Palmitoylated Galpha12 but not Galpha13 localizes in lipid rafts
phosphoprotein
-
phosphorylation of Galpha subunits is an important modification that regulates their function. Galpha12 is a substrate for phosphorylation by protein kinase C. Endogenous Ga12 in human platelets is phosphorylated within the first 50 N-terminal amino acid residues in response to PMA, thrombin and the TXA2 receptor agonist U46619. Phosphorylated Galpha12 loses its affinity for Gbetagamma, and the association with Gbetagamma reciprocally inhibits the phosphorylation of Ga12 by protein kinase C. Endogenous Galpha13 in platelets is phosphorylated in response to PMA, although not in vitro. PKC-mediated phosphorylation of Ga13 in cell might require additional factors
side-chain modification
additional information
-
Galpha12 and Galpha13 are not myristoylated because they lack a glycine residue as the second amino acid residue
PROTEIN VARIANTS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
CFP-TM-Galpha
-
consists of a cleavable signal peptide from human growth hormone, enhanced CFP, the amino-terminal amino acids of the rat mu-opioid receptor, including TM1 and intracellular loop1, and the human Galpha subunit
CFP-TM-Galphai3
-
C to G mutation at the -4 position to render them insensitive to PTX-mediated ADP-ribosylation
CFP-TM-GalphaoA
-
C to G mutation at the -4 position to render them insensitive to PTX-mediated ADP-ribosylation
CFP-TM-GalphaQ205L
-
active mutant
CFP-TM-Galphasq5
-
the five aminoacids normally found in the carboxyl terminus of Galphas, QYELL, are replaced with those normally found in the carboxy terminus of Galphaq, EYNLV
Q212L
site-directed mutagenesis,GTPase-deficient inactive mutant
R238E
-
mutant, reported to be a dominant-negative inhibitor of the rhodopsin-transducin-PDE visual system
S111N
-
mutation at carboxy-terminal end of helix alpha of helical domain, decreased nucleotide exchange kinetics, impaired adenylyl cyclase activation with GTPgammaS, but normal receptor and AlF4- activation
PURIFICATION (Commentary)
ORGANISM
UNIPROT
LITERATURE
using Ni-NTA His-binding affinity chromatography and a Mono Q column
-
CLONED (Commentary)
ORGANISM
UNIPROT
LITERATURE
expression in Escherichia coli
-
Gtalpha and GtalphaR238E for expression in Escherichia coli strains DH5alpha and BL21(DE3)
-
into pcDNA3.1 vector for transfection of HEK-293 cells
-
overexpression of heterotrimeric G-proteins Galphai1 and Galphai3 in Spodoptera frugiperda Sf 9 cell membranes using the baculovirus transfection method
-
APPLICATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
drug development
-
mutants of transducin represent a major tool in designing potential therapeutical strategies for a group of visual diseases
medicine
REF.
AUTHORS
TITLE
JOURNAL
VOL.
PAGES
YEAR
ORGANISM (UNIPROT)
PUBMED ID
SOURCE
Natochin, M.; Granovsky, A.E.; Artemyev, N.O.
Regulation of transducin GTPase activity by human retinal RGS
J. Biol. Chem.
272
17444-17449
1997
Homo sapiens
Manually annotated by BRENDA team
Ueda, H.; Misawa, H.; Katada, T.; Ui, M.; Takagi, H.; Satoh, M.
Functional reconstitution of purified Gi and Go with mue-opioid receptors in guinea pig striatal membranes pretreated with micromolar concentrations of N-ethylmaleimide
J. Neurochem.
54
841-848
1990
Bos taurus, Homo sapiens, Sus scrofa
Manually annotated by BRENDA team
Rouot, B.; Brabet, P.; Homburger, V.; Toutant, M.; Bockaert, J.
Go, a major brain GTP binding protein in search of a function: purification, immunological and biochemical characteristics
Biochimie
69
339-349
1987
Bos taurus, Canis lupus familiaris, Gallus gallus, Homo sapiens, Rattus norvegicus
Manually annotated by BRENDA team
Ross, B.M.; McLaughlin, M.; Roberts, M.; Milligan, G.; McCulloch, J.; Knowler, J.T.
Alterations in the activity of adenylate cyclase and high affinity GTPase in Alzheimer's disease
Brain Res.
622
35-42
1993
Homo sapiens
Manually annotated by BRENDA team
Sauvage, C.; Rumigny, J.F.; Maitre, M.
Purification and characterization of G proteins from human brain: modification of GTPase activity upon phosphorylation
Mol. Cell. Biochem.
107
65-77
1991
Homo sapiens
Manually annotated by BRENDA team
Neer, E.J.
Heterotrimeric G proteins: organizers of transmembrane signals
Cell
80
249-257
1995
Homo sapiens, Mammalia
Manually annotated by BRENDA team
Park, I.K.; Klug, C.A.; Li, K.; Jerabek, L.; Li, L.; Nanamori, M.; Neubig, R.R.; Hood, L.; Weissman, I.L.; Clarke, M.F.
Molecular cloning and characterization of a novel regulator of G-protein signaling from mouse hematopoietic stem cells
J. Biol. Chem.
276
915-923
2001
Homo sapiens
Manually annotated by BRENDA team
Brito, M.; Guzman, L.; Romo, X.; Soto, X.; Hinrichs, M.V.; Olate, J.
S111N mutation in the helical domain of human Gs(alpha) reduces its GDP/GTP exchange rate
J. Cell. Biochem.
85
615-620
2002
Homo sapiens
Manually annotated by BRENDA team
Siderovski, D.P.; Willard, F.S.
The GAPs, GEFs, and GDIs of heterotrimeric G-protein alpha subunits
Int. J. Biol. Sci.
1
51-66
2005
Aspergillus nidulans, Saccharomyces cerevisiae, Caenorhabditis elegans, Homo sapiens
Manually annotated by BRENDA team
Barren, B.; Natochin, M.; Artemyev, N.O.
Mutation R238E in transducin-alpha yields a GTPase and effector-deficient, but not dominant-negative, G-protein alpha-subunit
Mol. Vis.
12
492-498
2006
Homo sapiens
Manually annotated by BRENDA team
Pina, A.L.; Baumert, U.; Loyer, M.; Koenekoop, R.K.
A three base pair deletion encoding the amino acid (lysine-270) in the alpha-cone transducin gene
Mol. Vis.
10
265-271
2004
Homo sapiens
Manually annotated by BRENDA team
Digby, G.J.; Lober, R.M.; Sethi, P.R.; Lambert, N.A.
Some G protein heterotrimers physically dissociate in living cells
Proc. Natl. Acad. Sci. USA
21
17789-17794
2006
Homo sapiens
Manually annotated by BRENDA team
Preuss, I.; Kurig, B.; Nuernberg, B.; Orth, J.H.; Aktories, K.
Pasteurella multocida toxin activates Gbetagamma dimers of heterotrimeric G proteins
Cell. Signal.
21
551-558
2009
Homo sapiens, Mus musculus
Manually annotated by BRENDA team
Dave, R.H.; Saengsawang, W.; Yu, J.Z.; Donati, R.; Rasenick, M.M.
Heterotrimeric G-proteins interact directly with cytoskeletal components to modify microtubule-dependent cellular processes
Neurosignals
17
100-108
2009
Homo sapiens, Mus musculus, Rattus norvegicus
Manually annotated by BRENDA team
Orth, J.H.; Preuss, I.; Fester, I.; Schlosser, A.; Wilson, B.A.; Aktories, K.
Pasteurella multocida toxin activation of heterotrimeric G proteins by deamidation
Proc. Natl. Acad. Sci. USA
106
7179-7184
2009
Homo sapiens, Mus musculus
Manually annotated by BRENDA team
Kozasa, T.; Hajicek, N.; Chow, C.R.; Suzuki, N.
Signalling mechanisms of RhoGTPase regulation by the heterotrimeric G proteins G12 and G13
J. Biochem.
150
357-369
2011
Caenorhabditis elegans, Drosophila melanogaster, Homo sapiens
Manually annotated by BRENDA team
Zhao, P.; Nunn, C.; Ramineni, S.; Hepler, J.R.; Chidiac, P.
The Ras-binding domain region of RGS14 regulates its functional interactions with heterotrimeric G proteins
J. Cell. Biochem.
114
1414-1423
2013
Homo sapiens
Manually annotated by BRENDA team
Avasarala, S.; Bikkavilli, R.K.; Van Scoyk, M.; Zhang, W.; Lapite, A.; Hostetter, L.; Byers, J.T.; Heasley, L.E.; Sohn, J.W.; Winn, R.A.
Heterotrimeric G-protein, Galpha16, is a critical downstream effector of non-canonical Wnt signaling and a potent inhibitor of transformed cell growth in non small cell lung cancer
PLoS ONE
8
e76895
2013
Homo sapiens (P30679)
Manually annotated by BRENDA team
van Unen, J.; Yin, T.; Wu, Y.I.; Mastop, M.; Gadella, T.W.; Goedhart, J.
Kinetics of recruitment and allosteric activation of ARHGEF25 isoforms by the heterotrimeric G-protein Galphaq
Sci. Rep.
6
36825
2016
Homo sapiens
Manually annotated by BRENDA team