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IF2G_BOVIN
ID   IF2G_BOVIN              Reviewed;         472 AA.
AC   Q2KHU8; A5D972;
DT   15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT   07-MAR-2006, sequence version 1.
DT   03-AUG-2022, entry version 103.
DE   RecName: Full=Eukaryotic translation initiation factor 2 subunit 3;
DE            EC=3.6.5.3;
DE   AltName: Full=Eukaryotic translation initiation factor 2 subunit gamma;
DE            Short=eIF-2-gamma;
GN   Name=EIF2S3;
OS   Bos taurus (Bovine).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC   Eutheria; Laurasiatheria; Artiodactyla; Ruminantia; Pecora; Bovidae;
OC   Bovinae; Bos.
OX   NCBI_TaxID=9913;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA].
RC   STRAIN=Hereford; TISSUE=Heart ventricle;
RG   NIH - Mammalian Gene Collection (MGC) project;
RL   Submitted (JAN-2006) to the EMBL/GenBank/DDBJ databases.
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] OF 2-472.
RX   PubMed=16305752; DOI=10.1186/1471-2164-6-166;
RA   Harhay G.P., Sonstegard T.S., Keele J.W., Heaton M.P., Clawson M.L.,
RA   Snelling W.M., Wiedmann R.T., Van Tassell C.P., Smith T.P.L.;
RT   "Characterization of 954 bovine full-CDS cDNA sequences.";
RL   BMC Genomics 6:166-166(2005).
CC   -!- FUNCTION: As a subunit of eukaryotic initiation factor 2 (eIF-2),
CC       involved in the early steps of protein synthesis. In the presence of
CC       GTP, eIF-2 forms a ternary complex with initiator tRNA Met-tRNAi and
CC       then recruits the 40S ribosomal complex and initiation factors eIF-1,
CC       eIF-1A and eIF-3 to form the 43S pre-initiation complex (43S PIC), a
CC       step that determines the rate of protein translation. The 43S PIC binds
CC       to mRNA and scans downstream to the initiation codon, where it forms a
CC       48S initiation complex by codon-anticodon base pairing. This leads to
CC       the displacement of eIF-1 to allow GTPase-activating protein (GAP) eIF-
CC       5-mediated hydrolysis of eIF2-bound GTP. Hydrolysis of GTP and release
CC       of Pi, which makes GTP hydrolysis irreversible, causes the release of
CC       the eIF-2-GDP binary complex from the 40S subunit, an event that is
CC       essential for the subsequent joining of the 60S ribosomal subunit to
CC       form an elongation-competent 80S ribosome. In order for eIF-2 to
CC       recycle and catalyze another round of initiation, the GDP bound to eIF-
CC       2 must be exchanged with GTP by way of a reaction catalyzed by GDP-GTP
CC       exchange factor (GEF) eIF-2B (By similarity). Along with its paralog on
CC       chromosome Y, may contribute to spermatogenesis up to the round
CC       spermatid stage (By similarity). {ECO:0000250|UniProtKB:P32481,
CC       ECO:0000250|UniProtKB:Q9Z0N1}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=GTP + H2O = GDP + H(+) + phosphate; Xref=Rhea:RHEA:19669,
CC         ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:37565,
CC         ChEBI:CHEBI:43474, ChEBI:CHEBI:58189; EC=3.6.5.3;
CC         Evidence={ECO:0000250|UniProtKB:P32481};
CC   -!- SUBUNIT: The eukaryotic translation initiation factor 2 complex/eIF2 is
CC       a heterotrimer composed of an alpha subunit, also called subunit 1
CC       (encoded by EIF2S1), a beta subunit, also called subunit 2 (encoded by
CC       EIF2S2) and a gamma subunit, also called subunit 3 (encoded by EIF2S3).
CC       {ECO:0000250|UniProtKB:P41091}.
CC   -!- SIMILARITY: Belongs to the TRAFAC class translation factor GTPase
CC       superfamily. Classic translation factor GTPase family. EIF2G subfamily.
CC       {ECO:0000255|PROSITE-ProRule:PRU01059}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=ABQ12931.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR   EMBL; BC112875; AAI12876.1; -; mRNA.
DR   EMBL; BT030491; ABQ12931.1; ALT_INIT; mRNA.
DR   RefSeq; NP_001039582.1; NM_001046117.2.
DR   AlphaFoldDB; Q2KHU8; -.
DR   SMR; Q2KHU8; -.
DR   STRING; 9913.ENSBTAP00000019064; -.
DR   PaxDb; Q2KHU8; -.
DR   PeptideAtlas; Q2KHU8; -.
DR   PRIDE; Q2KHU8; -.
DR   Ensembl; ENSBTAT00000019064; ENSBTAP00000019064; ENSBTAG00000014337.
DR   GeneID; 512350; -.
DR   KEGG; bta:512350; -.
DR   CTD; 1968; -.
DR   VEuPathDB; HostDB:ENSBTAG00000014337; -.
DR   eggNOG; KOG0466; Eukaryota.
DR   GeneTree; ENSGT00550000074801; -.
DR   HOGENOM; CLU_027154_0_1_1; -.
DR   InParanoid; Q2KHU8; -.
DR   OMA; NIGMVGH; -.
DR   OrthoDB; 903135at2759; -.
DR   TreeFam; TF101513; -.
DR   Reactome; R-BTA-382556; ABC-family proteins mediated transport.
DR   Reactome; R-BTA-72695; Formation of the ternary complex, and subsequently, the 43S complex.
DR   Proteomes; UP000009136; Chromosome X.
DR   Bgee; ENSBTAG00000014337; Expressed in milk and 107 other tissues.
DR   GO; GO:0005850; C:eukaryotic translation initiation factor 2 complex; ISS:UniProtKB.
DR   GO; GO:0005525; F:GTP binding; IEA:UniProtKB-KW.
DR   GO; GO:0003924; F:GTPase activity; IEA:InterPro.
DR   GO; GO:0008135; F:translation factor activity, RNA binding; ISS:UniProtKB.
DR   GO; GO:0003743; F:translation initiation factor activity; ISS:UniProtKB.
DR   GO; GO:0000049; F:tRNA binding; IEA:InterPro.
DR   GO; GO:0001731; P:formation of translation preinitiation complex; IBA:GO_Central.
DR   GO; GO:0045903; P:positive regulation of translational fidelity; IBA:GO_Central.
DR   GO; GO:0006413; P:translational initiation; ISS:UniProtKB.
DR   CDD; cd01888; eIF2_gamma; 1.
DR   CDD; cd03688; eIF2_gamma_II; 1.
DR   CDD; cd15490; eIF2_gamma_III; 1.
DR   Gene3D; 3.40.50.300; -; 1.
DR   InterPro; IPR004161; EFTu-like_2.
DR   InterPro; IPR015256; eIF2g_C.
DR   InterPro; IPR044127; eIF2g_dom_2.
DR   InterPro; IPR044128; eIF2g_GTP-bd.
DR   InterPro; IPR027417; P-loop_NTPase.
DR   InterPro; IPR000795; T_Tr_GTP-bd_dom.
DR   InterPro; IPR009000; Transl_B-barrel_sf.
DR   InterPro; IPR009001; Transl_elong_EF1A/Init_IF2_C.
DR   Pfam; PF09173; eIF2_C; 1.
DR   Pfam; PF00009; GTP_EFTU; 1.
DR   Pfam; PF03144; GTP_EFTU_D2; 1.
DR   PRINTS; PR00315; ELONGATNFCT.
DR   SUPFAM; SSF50447; SSF50447; 1.
DR   SUPFAM; SSF50465; SSF50465; 1.
DR   SUPFAM; SSF52540; SSF52540; 1.
DR   PROSITE; PS51722; G_TR_2; 1.
PE   2: Evidence at transcript level;
KW   Acetylation; GTP-binding; Hydrolase; Initiation factor; Nucleotide-binding;
KW   Phosphoprotein; Protein biosynthesis; Reference proteome.
FT   INIT_MET        1
FT                   /note="Removed"
FT                   /evidence="ECO:0000250|UniProtKB:P41091"
FT   CHAIN           2..472
FT                   /note="Eukaryotic translation initiation factor 2 subunit
FT                   3"
FT                   /id="PRO_0000316003"
FT   DOMAIN          39..248
FT                   /note="tr-type G"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01059"
FT   REGION          48..55
FT                   /note="G1"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01059"
FT   REGION          76..80
FT                   /note="G2"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01059"
FT   REGION          134..137
FT                   /note="G3"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01059"
FT   REGION          190..193
FT                   /note="G4"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01059"
FT   REGION          225..227
FT                   /note="G5"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01059"
FT   BINDING         51..56
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000250|UniProtKB:P32481"
FT   BINDING         190..193
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000250|UniProtKB:P32481"
FT   BINDING         225..227
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000250|UniProtKB:P32481"
FT   MOD_RES         2
FT                   /note="N-acetylalanine"
FT                   /evidence="ECO:0000250|UniProtKB:P41091"
FT   MOD_RES         16
FT                   /note="Phosphoserine"
FT                   /evidence="ECO:0000250|UniProtKB:Q9Z0N1"
FT   CONFLICT        203
FT                   /note="Q -> H (in Ref. 2; ABQ12931)"
FT                   /evidence="ECO:0000305"
SQ   SEQUENCE   472 AA;  51065 MW;  87DFA2A7CFED4DFA CRC64;
     MAGGEAGVTL GQPHLSRQDL ATLDVSKLTP LSHEVISRQA TINIGTIGHV AHGKSTVVKA
     ISGVHTVRFK NELERNITIK LGYANAKIYK LDDPSCPRPE CYRSCGSSTP DEFPTDIPGT
     KGNFKLVRHV SFVDCPGHDI LMATMLNGAA VMDAALLLIA GNESCPQPQT SEHLAAIEIM
     KLKHILILQN KIDLVKESQA KEQYEQILAF VQGTVAEGAP IIPISAQLKY NIEVVCEYIV
     KKIPVPPRDF TSEPRLIVIR SFDVNKPGCE VDDLKGGVAG GSILKGVLKV GQEIEVRPGI
     VSKDSEGKLM CKPIFSKIVS LFAEHNDLQY AAPGGLIGVG TKIDPTLCRA DRMVGQVLGA
     VGALPEIFTE LEISYFLLRR LLGVRTEGDK KAAKVQKLSK NEVLMVNIGS LSTGGRVSAV
     KADLGKIVLT NPVCTEVGEK IALSRRVEKH WRLIGWGQIR RGVTIKPTVD DD
 
 
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