P20612
SS
Gene name |
Gnat1 (Gnat-1) |
Protein name |
Guanine nucleotide-binding protein G |
Names |
t subunit alpha-1 , Transducin alpha-1 chain |
Species |
Mus musculus (Mouse) |
KEGG Pathway |
mmu:14685 |
EC number |
|
Protein Class |
|
Descriptions
Gαi1 is a G-protein alpha subunit that plays a crucial role in signal transduction pathway initiated by G-protein-coupled receptor (GPCR) activation. G proteins function as transducers downstream of GPCRs in numerous signaling cascades. The alpha subunit contains the guanine nucleotide binding site and alternates between an active (GTP-bound state) and an inactive (GDP-bound state). Activated GPCR induces conformational change in Gαi1, which allows for GDP-to-GTP exchange by binding to the GPCR-binding site within a Ras-like domain, leading to dissociation of the Gαi1 subunit and initiation of downstream signaling.
Autoinhibitory domains (AIDs)
Target domain |
180-344 (Ras-like domain) |
Relief mechanism |
Ligand binding, Partner binding |
Assay |
|
Accessory elements
No accessory elements
References
- Goricanec D et al. (2016) "Conformational dynamics of a G-protein α subunit is tightly regulated by nucleotide binding", Proceedings of the National Academy of Sciences of the United States of America, 113, E3629-38
- Coleman DE et al. (1999) "Structure of Gialpha1.GppNHp, autoinhibition in a galpha protein-substrate complex", The Journal of biological chemistry, 274, 16669-72
- Lutz S et al. (2007) "Structure of Galphaq-p63RhoGEF-RhoA complex reveals a pathway for the activation of RhoA by GPCRs", Science (New York, N.Y.), 318, 1923-7
Autoinhibited structure
Activated structure
1 structures for P20612
| Entry ID | Method | Resolution | Chain | Position | Source |
|---|---|---|---|---|---|
| AF-P20612-F1 | Predicted | AlphaFoldDB |
12 variants for P20612
| Variant ID(s) | Position | Change | Description | Diseaes Association | Provenance |
|---|---|---|---|---|---|
| rs3389068367 | 3 | A>T | No | EVA | |
| rs3389075656 | 18 | K>N | No | EVA | |
| rs3389081015 | 39 | E>* | No | EVA | |
| rs3389050800 | 40 | S>WLR* | No | EVA | |
| rs3389064584 | 93 | D>G | No | EVA | |
| rs3389080042 | 139 | A>T | No | EVA | |
| rs3389070958 | 161 | P>T | No | EVA | |
| rs3389079234 | 191 | N>D | No | EVA | |
| rs3389079234 | 191 | N>H | No | EVA | |
| rs3389080044 | 221 | A>P | No | EVA | |
| rs3400085863 | 229 | V>E | No | EVA | |
| rs3389058725 | 349 | L>F | No | EVA |
No associated diseases with P20612
No regional properties for P20612
| Type | Name | Position | InterPro Accession |
|---|---|---|---|
| No domain, repeats, and functional sites for P20612 | |||
Functions
8 GO annotations of cellular component
| Name | Definition |
|---|---|
| apical plasma membrane | The region of the plasma membrane located at the apical end of the cell. |
| cytoplasm | The contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures. |
| heterotrimeric G-protein complex | Any of a family of heterotrimeric GTP-binding and hydrolyzing proteins; they belong to a superfamily of GTPases that includes monomeric proteins such as EF-Tu and RAS. Heterotrimeric G-proteins consist of three subunits; the alpha subunit contains the guanine nucleotide binding site and possesses GTPase activity; the beta and gamma subunits are tightly associated and function as a beta-gamma heterodimer; extrinsic plasma membrane proteins (cytoplasmic face) that function as a complex to transduce signals from G protein-coupled receptors to an effector protein. |
| membrane | A lipid bilayer along with all the proteins and protein complexes embedded in it and attached to it. |
| neuronal cell body | The portion of a neuron that includes the nucleus, but excludes cell projections such as axons and dendrites. |
| photoreceptor connecting cilium | The portion of the photoreceptor cell cilium linking the photoreceptor inner and outer segments. It's considered to be equivalent to the ciliary transition zone. |
| photoreceptor inner segment | The inner segment of a vertebrate photoreceptor containing mitochondria, ribosomes and membranes where opsin molecules are assembled and passed to be part of the outer segment discs. |
| photoreceptor outer segment | The outer segment of a vertebrate photoreceptor that contains a stack of membrane discs embedded with photoreceptor proteins. |
5 GO annotations of molecular function
| Name | Definition |
|---|---|
| G protein-coupled receptor binding | Binding to a G protein-coupled receptor. |
| G-protein beta/gamma-subunit complex binding | Binding to a complex of G-protein beta/gamma subunits. |
| GTP binding | Binding to GTP, guanosine triphosphate. |
| GTPase activity | Catalysis of the reaction |
| metal ion binding | Binding to a metal ion. |
24 GO annotations of biological process
| Name | Definition |
|---|---|
| adenylate cyclase-modulating G protein-coupled receptor signaling pathway | A G protein-coupled receptor signaling pathway in which the signal is transmitted via the activation or inhibition of adenylyl cyclase activity and a subsequent change in the intracellular concentration of cyclic AMP (cAMP). |
| background adaptation | Any process in which an organism changes its pigmentation (lightening in response to a brighter environment or darkening in response to a dimmer environment) in response to a change in light intensity. |
| cell population proliferation | The multiplication or reproduction of cells, resulting in the expansion of a cell population. |
| cellular response to electrical stimulus | Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of an electrical stimulus. |
| detection of chemical stimulus involved in sensory perception of bitter taste | The series of events required for a bitter taste stimulus to be received and converted to a molecular signal. |
| detection of light stimulus | The series of events in which a light stimulus (in the form of photons) is received and converted into a molecular signal. |
| detection of light stimulus involved in visual perception | The series of events involved in visual perception in which a light stimulus is received and converted into a molecular signal. |
| dopamine secretion | The regulated release of dopamine by a cell. Dopamine is a catecholamine and a precursor of adrenaline and noradrenaline. It acts as a neurotransmitter in the central nervous system but it is also produced peripherally and acts as a hormone. |
| eye photoreceptor cell development | Development of a photoreceptor, a sensory cell in the eye that reacts to the presence of light. They usually contain a pigment that undergoes a chemical change when light is absorbed, thus stimulating a nerve. |
| G protein-coupled receptor signaling pathway | The series of molecular signals initiated by a ligand binding to its receptor, in which the activated receptor promotes the exchange of GDP for GTP on the alpha-subunit of an associated heterotrimeric G-protein complex. The GTP-bound activated alpha-G-protein then dissociates from the beta- and gamma-subunits to further transmit the signal within the cell. The pathway begins with receptor-ligand interaction, and ends with regulation of a downstream cellular process. The pathway can start from the plasma membrane, Golgi or nuclear membrane. |
| G protein-coupled receptor signaling pathway coupled to cGMP nucleotide second messenger | The series of molecular signals generated as a consequence of a G protein-coupled receptor binding to its physiological ligand, followed by activation of guanylyl cyclase (GC) activity and a subsequent increase in the concentration of cyclic GMP (cGMP). |
| neural tissue regeneration | The regrowth of neural tissue following its loss or destruction. |
| phototransduction | The sequence of reactions within a cell required to convert absorbed photons into a molecular signal. |
| phototransduction, visible light | The sequence of reactions within a cell required to convert absorbed photons from visible light into a molecular signal. A visible light stimulus is electromagnetic radiation that can be perceived visually by an organism; for organisms lacking a visual system, this can be defined as light with a wavelength within the range 380 to 780 nm. |
| response to light intensity | Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a light intensity stimulus. |
| response to light stimulus | Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a light stimulus, electromagnetic radiation of wavelengths classified as infrared, visible or ultraviolet light. |
| response to organic cyclic compound | Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of an organic cyclic compound stimulus. |
| retina development in camera-type eye | The process whose specific outcome is the progression of the retina over time, from its formation to the mature structure. The retina is the innermost layer or coating at the back of the eyeball, which is sensitive to light and in which the optic nerve terminates. |
| retinal cone cell differentiation | The process in which a relatively unspecialized cell acquires the specialized features of a retinal cone cell. |
| retinal rod cell differentiation | The process in which a relatively unspecialized cell acquires the specialized features of a retinal rod cell. |
| rhodopsin mediated signaling pathway | A G protein-coupled receptor signaling pathway initiated by the excitation of rhodopsin by a photon, and ending with the regulation of a downstream cellular process. |
| sensory perception of umami taste | The series of events required to receive an umami taste stimulus, convert it to a molecular signal, and recognize and characterize the signal. Umami taste is the savory taste of meats and other foods that are rich in glutamates. This is a neurological process. |
| visual behavior | The behavior of an organism in response to a visual stimulus. |
| visual perception | The series of events required for an organism to receive a visual stimulus, convert it to a molecular signal, and recognize and characterize the signal. Visual stimuli are detected in the form of photons and are processed to form an image. |
58 homologous proteins in AiPD
| UniProt AC | Gene Name | Protein Name | Species | Evidence Code |
|---|---|---|---|---|
| P63097 | GNAI1 | Guanine nucleotide-binding protein G | Bos taurus (Bovine) | SS |
| P0C7Q4 | GNAT3 | Guanine nucleotide-binding protein G | Bos taurus (Bovine) | SS |
| P04696 | GNAT2 | Guanine nucleotide-binding protein G | Bos taurus (Bovine) | SS |
| P08239 | GNAO1 | Guanine nucleotide-binding protein G | Bos taurus (Bovine) | SS |
| P04695 | GNAT1 | Guanine nucleotide-binding protein G | Bos taurus (Bovine) | SS |
| P50147 | GNAI2 | Guanine nucleotide-binding protein G | Gallus gallus (Chicken) | SS |
| P50146 | GNAI1 | Guanine nucleotide-binding protein G | Gallus gallus (Chicken) | SS |
| P20353 | Galphai | G protein alpha i subunit | Drosophila melanogaster (Fruit fly) | SS |
| P16378 | Galphao | G protein alpha o subunit | Drosophila melanogaster (Fruit fly) | SS |
| P25157 | cta | Guanine nucleotide-binding protein subunit alpha homolog | Drosophila melanogaster (Fruit fly) | SS |
| P19087 | GNAT2 | Guanine nucleotide-binding protein G | Homo sapiens (Human) | SS |
| P09471 | GNAO1 | Guanine nucleotide-binding protein G | Homo sapiens (Human) | SS |
| Q03113 | GNA12 | Guanine nucleotide-binding protein subunit alpha-12 | Homo sapiens (Human) | SS |
| P04899 | GNAI2 | Guanine nucleotide-binding protein G | Homo sapiens (Human) | SS |
| P63096 | GNAI1 | Guanine nucleotide-binding protein G | Homo sapiens (Human) | EV |
| P08754 | GNAI3 | Guanine nucleotide-binding protein G | Homo sapiens (Human) | SS |
| A8MTJ3 | GNAT3 | Guanine nucleotide-binding protein G | Homo sapiens (Human) | SS |
| Q14344 | GNA13 | Guanine nucleotide-binding protein subunit alpha-13 | Homo sapiens (Human) | SS |
| P19086 | GNAZ | Guanine nucleotide-binding protein G | Homo sapiens (Human) | SS |
| P11488 | GNAT1 | Guanine nucleotide-binding protein G | Homo sapiens (Human) | SS |
| B2RSH2 | Gnai1 | Guanine nucleotide-binding protein G | Mus musculus (Mouse) | SS |
| O70443 | Gnaz | Guanine nucleotide-binding protein G | Mus musculus (Mouse) | SS |
| P08752 | Gnai2 | Guanine nucleotide-binding protein G | Mus musculus (Mouse) | SS |
| P27600 | Gna12 | Guanine nucleotide-binding protein subunit alpha-12 | Mus musculus (Mouse) | SS |
| P27601 | Gna13 | Guanine nucleotide-binding protein subunit alpha-13 | Mus musculus (Mouse) | SS |
| P50149 | Gnat2 | Guanine nucleotide-binding protein G | Mus musculus (Mouse) | SS |
| Q3V3I2 | Gnat3 | Guanine nucleotide-binding protein G | Mus musculus (Mouse) | SS |
| Q9DC51 | Gnai3 | Guanine nucleotide-binding protein G | Mus musculus (Mouse) | SS |
| P21279 | Gnaq | Guanine nucleotide-binding protein G(q) subunit alpha | Mus musculus (Mouse) | PR |
| P30678 | Gna15 | Guanine nucleotide-binding protein subunit alpha-15 | Mus musculus (Mouse) | PR |
| P18872 | Gnao1 | Guanine nucleotide-binding protein G | Mus musculus (Mouse) | SS |
| P93564 | GPA1 | Guanine nucleotide-binding protein alpha-1 subunit | Solanum tuberosum (Potato) | SS |
| Q63210 | Gna12 | Guanine nucleotide-binding protein subunit alpha-12 | Rattus norvegicus (Rat) | SS |
| P19627 | Gnaz | Guanine nucleotide-binding protein G | Rattus norvegicus (Rat) | SS |
| P29348 | Gnat3 | Guanine nucleotide-binding protein G | Rattus norvegicus (Rat) | SS |
| P04897 | Gnai2 | Guanine nucleotide-binding protein G | Rattus norvegicus (Rat) | SS |
| P59215 | Gnao1 | Guanine nucleotide-binding protein G | Rattus norvegicus (Rat) | SS |
| P08753 | Gnai3 | Guanine nucleotide-binding protein G | Rattus norvegicus (Rat) | SS |
| Q6Q7Y5 | Gna13 | Guanine nucleotide-binding protein subunit alpha-13 | Rattus norvegicus (Rat) | SS |
| Q0DJ33 | GPA1 | Guanine nucleotide-binding protein alpha-1 subunit | Oryza sativa subsp. japonica (Rice) | SS |
| P51875 | goa-1 | Guanine nucleotide-binding protein G | Caenorhabditis elegans | SS |
| Q18434 | odr-3 | Guanine nucleotide-binding protein alpha-17 subunit | Caenorhabditis elegans | SS |
| Q9BIG4 | gpa-10 | Guanine nucleotide-binding protein alpha-10 subunit | Caenorhabditis elegans | PR |
| P28052 | gpa-3 | Guanine nucleotide-binding protein alpha-3 subunit | Caenorhabditis elegans | SS |
| Q9XTB2 | gpa-13 | Guanine nucleotide-binding protein alpha-13 subunit | Caenorhabditis elegans | SS |
| Q9BIG5 | gpa-4 | Guanine nucleotide-binding protein alpha-4 subunit | Caenorhabditis elegans | SS |
| P28051 | gpa-1 | Guanine nucleotide-binding protein alpha-1 subunit | Caenorhabditis elegans | SS |
| Q9N2V6 | gpa-16 | Guanine nucleotide-binding protein alpha-16 subunit | Caenorhabditis elegans | SS |
| P91907 | gpa-15 | Guanine nucleotide-binding protein alpha-15 subunit | Caenorhabditis elegans | SS |
| Q20907 | gpa-8 | Guanine nucleotide-binding protein alpha-8 subunit | Caenorhabditis elegans | PR |
| Q21917 | gpa-7 | Guanine nucleotide-binding protein alpha-7 subunit | Caenorhabditis elegans | SS |
| Q93743 | gpa-6 | Guanine nucleotide-binding protein alpha-6 subunit | Caenorhabditis elegans | SS |
| O76584 | gpa-11 | Guanine nucleotide-binding protein alpha-11 subunit | Caenorhabditis elegans | SS |
| P49084 | GPA1 | Guanine nucleotide-binding protein alpha-1 subunit | Glycine max (Soybean) (Glycine hispida) | SS |
| P93163 | GPA2 | Guanine nucleotide-binding protein alpha-2 subunit | Glycine max (Soybean) (Glycine hispida) | SS |
| O80462 | XLG1 | Extra-large guanine nucleotide-binding protein 1 | Arabidopsis thaliana (Mouse-ear cress) | PR |
| P18064 | GPA1 | Guanine nucleotide-binding protein alpha-1 subunit | Arabidopsis thaliana (Mouse-ear cress) | SS |
| P26981 | GPA1 | Guanine nucleotide-binding protein alpha-1 subunit | Solanum lycopersicum (Tomato) (Lycopersicon esculentum) | SS |
| 10 | 20 | 30 | 40 | 50 | 60 |
| MGAGASAEEK | HSRELEKKLK | EDAEKDARTV | KLLLLGAGES | GKSTIVKQMK | IIHQDGYSLE |
| 70 | 80 | 90 | 100 | 110 | 120 |
| ECLEFIAIIY | GNTLQSILAI | VRAMTTLNIQ | YGDSARQDDA | RKLMHMADTI | EEGTMPKEMS |
| 130 | 140 | 150 | 160 | 170 | 180 |
| DIIQRLWKDS | GIQACFDRAS | EYQLNDSAGY | YLSDLERLVT | PGYVPTEQDV | LRSRVKTTGI |
| 190 | 200 | 210 | 220 | 230 | 240 |
| IETQFSFKDL | NFRMFDVGGQ | RSERKKWIHC | FEGVTCIIFI | AALSAYDMVL | VEDDEVNRMH |
| 250 | 260 | 270 | 280 | 290 | 300 |
| ESLHLFNSIC | NHRYFATTSI | VLFLNKKDVF | SEKIKKAHLS | ICFPDYDGPN | TYEDAGNYIK |
| 310 | 320 | 330 | 340 | ||
| VQFLELNMRR | DVKEIYSHMT | CATDTQNVKF | VFDAVTDIII | KENLKDCGLF |