ID   GNAI_LYMST              Reviewed;         354 AA.
AC   P30682;
DT   01-APR-1993, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2007, sequence version 3.
DT   03-AUG-2022, entry version 107.
DE   RecName: Full=Guanine nucleotide-binding protein G(i) subunit alpha;
DE   AltName: Full=Adenylate cyclase-inhibiting G alpha protein;
OS   Lymnaea stagnalis (Great pond snail) (Helix stagnalis).
OC   Eukaryota; Metazoa; Spiralia; Lophotrochozoa; Mollusca; Gastropoda;
OC   Heterobranchia; Euthyneura; Panpulmonata; Hygrophila; Lymnaeoidea;
OC   Lymnaeidae; Lymnaea.
OX   NCBI_TaxID=6523;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RC   TISSUE=CNS;
RX   PubMed=1468550; DOI=10.1016/0014-5793(92)81474-z;
RA   Knol J.C., Weidemann W., Planta R.J., Vreugdenhil E., van Heerikhuizen H.;
RT   "Molecular cloning of G protein alpha subunits from the central nervous
RT   system of the mollusc Lymnaea stagnalis.";
RL   FEBS Lett. 314:215-219(1992).
CC   -!- FUNCTION: Guanine nucleotide-binding proteins (G proteins) are involved
CC       as modulators or transducers in various transmembrane signaling
CC       systems. The G(i) proteins are involved in hormonal regulation of
CC       adenylate cyclase: they inhibit the cyclase in response to beta-
CC       adrenergic stimuli.
CC   -!- SUBUNIT: G proteins are composed of 3 units; alpha, beta and gamma. The
CC       alpha chain contains the guanine nucleotide binding site.
CC   -!- SIMILARITY: Belongs to the G-alpha family. G(i/o/t/z) subfamily.
CC       {ECO:0000305}.
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DR   EMBL; Z15095; CAA78807.1; -; mRNA.
DR   PIR; S27013; S27013.
DR   AlphaFoldDB; P30682; -.
DR   SMR; P30682; -.
DR   GO; GO:0110165; C:cellular anatomical entity; IEA:UniProt.
DR   GO; GO:0031683; F:G-protein beta/gamma-subunit complex binding; IEA:InterPro.
DR   GO; GO:0005525; F:GTP binding; IEA:UniProtKB-KW.
DR   GO; GO:0003924; F:GTPase activity; IEA:InterPro.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0007188; P:adenylate cyclase-modulating G protein-coupled receptor signaling pathway; IEA:InterPro.
DR   CDD; cd00066; G-alpha; 1.
DR   Gene3D; 1.10.400.10; -; 1.
DR   Gene3D; 3.40.50.300; -; 1.
DR   InterPro; IPR001408; Gprotein_alpha_I.
DR   InterPro; IPR001019; Gprotein_alpha_su.
DR   InterPro; IPR011025; GproteinA_insert.
DR   InterPro; IPR027417; P-loop_NTPase.
DR   PANTHER; PTHR10218; PTHR10218; 1.
DR   Pfam; PF00503; G-alpha; 1.
DR   PRINTS; PR00318; GPROTEINA.
DR   PRINTS; PR00441; GPROTEINAI.
DR   SMART; SM00275; G_alpha; 1.
DR   SUPFAM; SSF47895; SSF47895; 1.
DR   SUPFAM; SSF52540; SSF52540; 1.
DR   PROSITE; PS51882; G_ALPHA; 1.
PE   2: Evidence at transcript level;
KW   GTP-binding; Lipoprotein; Magnesium; Metal-binding; Myristate;
KW   Nucleotide-binding; Palmitate; Transducer.
FT   INIT_MET        1
FT                   /note="Removed"
FT                   /evidence="ECO:0000250"
FT   CHAIN           2..354
FT                   /note="Guanine nucleotide-binding protein G(i) subunit
FT                   alpha"
FT                   /id="PRO_0000203688"
FT   DOMAIN          32..354
FT                   /note="G-alpha"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01230"
FT   REGION          35..48
FT                   /note="G1 motif"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01230"
FT   REGION          173..181
FT                   /note="G2 motif"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01230"
FT   REGION          196..205
FT                   /note="G3 motif"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01230"
FT   REGION          265..272
FT                   /note="G4 motif"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01230"
FT   REGION          324..329
FT                   /note="G5 motif"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01230"
FT   BINDING         40..47
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000250"
FT   BINDING         47
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000250"
FT   BINDING         175..181
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000250"
FT   BINDING         181
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000250"
FT   BINDING         200..204
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000250"
FT   BINDING         269..272
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000250"
FT   BINDING         326
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000250"
FT   LIPID           2
FT                   /note="N-myristoyl glycine"
FT                   /evidence="ECO:0000255"
FT   LIPID           3
FT                   /note="S-palmitoyl cysteine"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   354 AA;  40486 MW;  69F988D6C6EDC991 CRC64;
     MGCVTSQEDK AAVERSKQID KSLRMDGEKA AREVKLLLLG AGESGKSTIV KQMKIIHEKG
     YSQEECLQYK PVVYSNAIQS MIAIIKAMGQ LKIQFGHPDR AEDARQFFAL AGHADEGEMS
     AELSGIMKRL WKDVGVQECF SRSREYQLND SAEYYLNALD RISAPGYIPT EQDVLRTRVK
     TTGIVETHFT FKDLHFKMFD VGGQRSERKK WIHCFEGVTA IIFIVAMSEY DLTLAEDQEM
     NRMMESMKLF DSICNNKWFT ETSIILFLNK KDLFEEKIKK SPLTICFPEY TGANTYEEAA
     AYIQLQFENL NKKKDTKEIY SHFTCATDTN NVQFVFDAVT DVIIKNNLKD CGLF