IF2G_PONAB
ID IF2G_PONAB Reviewed; 472 AA.
AC Q5R797;
DT 12-JUN-2007, integrated into UniProtKB/Swiss-Prot.
DT 21-DEC-2004, sequence version 1.
DT 03-AUG-2022, entry version 83.
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 Pongo abelii (Sumatran orangutan) (Pongo pygmaeus abelii).
OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae;
OC Pongo.
OX NCBI_TaxID=9601;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA].
RC TISSUE=Kidney;
RG The German cDNA consortium;
RL Submitted (NOV-2004) to the EMBL/GenBank/DDBJ databases.
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}.
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DR EMBL; CR860221; CAH92363.1; -; mRNA.
DR AlphaFoldDB; Q5R797; -.
DR SMR; Q5R797; -.
DR STRING; 9601.ENSPPYP00000022595; -.
DR eggNOG; KOG0466; Eukaryota.
DR InParanoid; Q5R797; -.
DR Proteomes; UP000001595; Unplaced.
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:0003743; F:translation initiation factor activity; IEA:UniProtKB-KW.
DR GO; GO:0000049; F:tRNA binding; IEA:InterPro.
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_0000290338"
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"
SQ SEQUENCE 472 AA; 51120 MW; 7A2BF8BAAF6DFA80 CRC64;
MAGGEAGVTL GQPHLSRQDL TTLDVTKLTP 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 NEVLMVNIGP LSTGGRVSAV
KADLGKIVLT NPVCTEVGEK IALSRRVEKH WRLIGWGQIR RGVTIKPTVD DD
