ID EIF1_HUMAN Reviewed; 113 AA. AC P41567; Q9UNQ9; DT 01-NOV-1995, integrated into UniProtKB/Swiss-Prot. DT 01-NOV-1995, sequence version 1. DT 04-NOV-2026, entry version 201. DE RecName: Full=Eukaryotic translation initiation factor 1 {ECO:0000303|PubMed:9732867}; DE Short=eIF1 {ECO:0000303|PubMed:9732867}; DE AltName: Full=A121; DE AltName: Full=Protein translation factor SUI1 homolog; DE AltName: Full=Sui1iso1; GN Name=EIF1; Synonyms=SUI1; OS Homo sapiens (Human). OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; OC Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; OC Homo. OX NCBI_TaxID=9606; RN [1] RP NUCLEOTIDE SEQUENCE [MRNA]. RX PubMed=7904817; DOI=10.1006/bbrc.1994.1040; RA Fields C.A., Adams M.D.; RT "Expressed sequence tags identify a human isolog of the suil translation RT initiation factor."; RL Biochem. Biophys. Res. Commun. 198:288-291(1994). RN [2] RP NUCLEOTIDE SEQUENCE [MRNA]. RC TISSUE=Brain; RA Singh S.K., Murray S.F., Chin L.S.; RT "Okadaic acid-responsive genes in malignant glioma cells identified by mRNA RT differential display."; RL Submitted (AUG-1998) to the EMBL/GenBank/DDBJ databases. RN [3] RP NUCLEOTIDE SEQUENCE [MRNA]. RX PubMed=10347211; DOI=10.1074/jbc.274.23.16487; RA Sheikh M.S., Fernandez-Salas E., Yu M., Hussain A., Dinman J.D., RA Peltz S.W., Huang Y., Fornace A.J. Jr.; RT "Cloning and characterization of a human genotoxic and endoplasmic RT reticulum stress-inducible cDNA that encodes translation initiation factor RT 1 (eIF1(A121/SUI1))."; RL J. Biol. Chem. 274:16487-16493(1999). RN [4] RP NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA]. RC TISSUE=Eye, and Lung; RX PubMed=15489334; DOI=10.1101/gr.2596504; RG The MGC Project Team; RT "The status, quality, and expansion of the NIH full-length cDNA project: RT the Mammalian Gene Collection (MGC)."; RL Genome Res. 14:2121-2127(2004). RN [5] RP FUNCTION. RX PubMed=9732867; DOI=10.1038/29703; RA Pestova T.V., Borukhov S.I., Hellen C.U.; RT "Eukaryotic ribosomes require initiation factors 1 and 1A to locate RT initiation codons."; RL Nature 394:854-859(1998). RN [6] RP INTERACTION WITH RENT2. RX PubMed=11073994; DOI=10.1128/mcb.20.23.8944-8957.2000; RA Mendell J.T., Medghalchi S.M., Lake R.G., Noensie E.N., Dietz H.C.; RT "Novel Upf2p orthologues suggest a functional link between translation RT initiation and nonsense surveillance complexes."; RL Mol. Cell. Biol. 20:8944-8957(2000). RN [7] RP FUNCTION. RX PubMed=12435632; DOI=10.1101/gad.1020902; RA Pestova T.V., Kolupaeva V.G.; RT "The roles of individual eukaryotic translation initiation factors in RT ribosomal scanning and initiation codon selection."; RL Genes Dev. 16:2906-2922(2002). RN [8] RP FUNCTION. RX PubMed=14600024; DOI=10.1101/gad.1141803; RA Lomakin I.B., Kolupaeva V.G., Marintchev A., Wagner G., Pestova T.V.; RT "Position of eukaryotic initiation factor eIF1 on the 40S ribosomal subunit RT determined by directed hydroxyl radical probing."; RL Genes Dev. 17:2786-2797(2003). RN [9] RP ACETYLATION [LARGE SCALE ANALYSIS] AT SER-2, CLEAVAGE OF INITIATOR RP METHIONINE [LARGE SCALE ANALYSIS], AND IDENTIFICATION BY MASS SPECTROMETRY RP [LARGE SCALE ANALYSIS]. RX PubMed=19413330; DOI=10.1021/ac9004309; RA Gauci S., Helbig A.O., Slijper M., Krijgsveld J., Heck A.J., Mohammed S.; RT "Lys-N and trypsin cover complementary parts of the phosphoproteome in a RT refined SCX-based approach."; RL Anal. Chem. 81:4493-4501(2009). RN [10] RP ACETYLATION [LARGE SCALE ANALYSIS] AT SER-2, CLEAVAGE OF INITIATOR RP METHIONINE [LARGE SCALE ANALYSIS], AND IDENTIFICATION BY MASS SPECTROMETRY RP [LARGE SCALE ANALYSIS]. RC TISSUE=Cervix carcinoma; RX PubMed=20068231; DOI=10.1126/scisignal.2000475; RA Olsen J.V., Vermeulen M., Santamaria A., Kumar C., Miller M.L., RA Jensen L.J., Gnad F., Cox J., Jensen T.S., Nigg E.A., Brunak S., Mann M.; RT "Quantitative phosphoproteomics reveals widespread full phosphorylation RT site occupancy during mitosis."; RL Sci. Signal. 3:RA3-RA3(2010). RN [11] RP ACETYLATION [LARGE SCALE ANALYSIS] AT SER-2, PHOSPHORYLATION [LARGE SCALE RP ANALYSIS] AT SER-9, CLEAVAGE OF INITIATOR METHIONINE [LARGE SCALE RP ANALYSIS], AND IDENTIFICATION BY MASS SPECTROMETRY [LARGE SCALE ANALYSIS]. RX PubMed=21406692; DOI=10.1126/scisignal.2001570; RA Rigbolt K.T., Prokhorova T.A., Akimov V., Henningsen J., Johansen P.T., RA Kratchmarova I., Kassem M., Mann M., Olsen J.V., Blagoev B.; RT "System-wide temporal characterization of the proteome and phosphoproteome RT of human embryonic stem cell differentiation."; RL Sci. Signal. 4:RS3-RS3(2011). RN [12] RP FUNCTION, SUBUNIT, AND INTERACTION WITH EIF5. RX PubMed=22813744; DOI=10.1016/j.celrep.2012.04.007; RA Luna R.E., Arthanari H., Hiraishi H., Nanda J., Martin-Marcos P., RA Markus M.A., Akabayov B., Milbradt A.G., Luna L.E., Seo H.C., Hyberts S.G., RA Fahmy A., Reibarkh M., Miles D., Hagner P.R., O'Day E.M., Yi T., RA Marintchev A., Hinnebusch A.G., Lorsch J.R., Asano K., Wagner G.; RT "The C-terminal domain of eukaryotic initiation factor 5 promotes start RT codon recognition by its dynamic interplay with eIF1 and eIF2beta."; RL Cell Rep. 1:689-702(2012). RN [13] RP FUNCTION. RX PubMed=24319994; DOI=10.1021/bi4009775; RA Luna R.E., Arthanari H., Hiraishi H., Akabayov B., Tang L., Cox C., RA Markus M.A., Luna L.E., Ikeda Y., Watanabe R., Bedoya E., Yu C., RA Alikhan S., Wagner G., Asano K.; RT "The interaction between eukaryotic initiation factor 1A and eIF5 retains RT eIF1 within scanning preinitiation complexes."; RL Biochemistry 52:9510-9518(2013). RN [14] RP PHOSPHORYLATION [LARGE SCALE ANALYSIS] AT SER-2 AND SER-9, AND RP IDENTIFICATION BY MASS SPECTROMETRY [LARGE SCALE ANALYSIS]. RC TISSUE=Erythroleukemia; RX PubMed=23186163; DOI=10.1021/pr300630k; RA Zhou H., Di Palma S., Preisinger C., Peng M., Polat A.N., Heck A.J., RA Mohammed S.; RT "Toward a comprehensive characterization of a human cancer cell RT phosphoproteome."; RL J. Proteome Res. 12:260-271(2013). RN [15] RP FUNCTION, INTERACTION WITH EIF4G1, AND MUTAGENESIS OF 57-LYS-LYS-58 AND RP 109-LYS--HIS-111. RX PubMed=29987188; DOI=10.1128/mcb.00139-18; RA Haimov O., Sehrawat U., Tamarkin-Ben Harush A., Bahat A., Uzonyi A., RA Will A., Hiraishi H., Asano K., Dikstein R.; RT "Dynamic interaction of eukaryotic initiation factor 4G1 (eIF4G1) with RT eIF4E and eIF1 underlies scanning-dependent and -independent translation."; RL Mol. Cell. Biol. 38:0-0(2018). RN [16] {ECO:0000312|PDB:2IF1} RP STRUCTURE BY NMR. RX PubMed=10228174; DOI=10.1093/emboj/18.9.2631; RA Fletcher C.M., Pestova T.V., Hellen C.U., Wagner G.; RT "Structure and interactions of the translation initiation factor eIF1."; RL EMBO J. 18:2631-2637(1999). CC -!- FUNCTION: Component of the 43S pre-initiation complex (43S PIC), which CC binds to the mRNA cap-proximal region, scans mRNA 5'-untranslated CC region, and locates the initiation codon (PubMed:12435632, CC PubMed:14600024, PubMed:9732867). Together with eIF1A (EIF1AX), EIF1 CC facilitates scanning and is essential for start codon recognition on CC the basis of AUG nucleotide context and location relative to the 5'-cap CC (PubMed:12435632, PubMed:14600024, PubMed:9732867). Participates to CC initiation codon selection by influencing the conformation of the 40S CC ribosomal subunit and the positions of bound mRNA and initiator tRNA; CC this is possible after its binding to the interface surface of the CC platform of the 40S ribosomal subunit close to the P-site CC (PubMed:14600024). Together with eIF1A (EIF1AX), also regulates the CC opening and closing of the mRNA binding channel, which ensures mRNA CC recruitment, scanning and the fidelity of initiation codon selection CC (PubMed:9732867). Continuously monitors and protects against premature CC and partial base-pairing of codons in the 5'-UTR with the anticodon of CC initiator tRNA (PubMed:12435632, PubMed:9732867). Together with eIF1A CC (EIF1AX), acts for ribosomal scanning, promotion of the assembly of 48S CC complex at the initiation codon (43S PIC becomes 48S PIC after the CC start codon is reached), and dissociation of aberrant complexes CC (PubMed:9732867). Interacts with EIF4G1, which in a mutual exclusive CC interaction associates either with EIF1 or with EIF4E on a common CC binding site (PubMed:29987188). EIF4G1-EIF1 complex promotes ribosome CC scanning (on both short and long 5'UTR), leaky scanning (on short CC 5'UTR) which is the bypass of the initial start codon, and CC discrimination against cap-proximal AUG (PubMed:29987188). Is probably CC maintained within the 43S PIC in open conformation thanks to eIF1A-EIF5 CC interaction (PubMed:24319994). Once the correct start codon is reached, CC EIF1 is physically excluded from the decoding site, shifting the PIC CC into the closed conformation and arresting it at the start codon CC (PubMed:22813744). {ECO:0000269|PubMed:12435632, CC ECO:0000269|PubMed:14600024, ECO:0000269|PubMed:22813744, CC ECO:0000269|PubMed:29987188, ECO:0000269|PubMed:9732867}. CC -!- SUBUNIT: Component of the 43S pre-initiation complex (43S PIC), which CC is composed of the 40S ribosomal subunit, EIF1, eIF1A (EIF1AX), eIF3 CC complex, EIF5 and eIF2-GTP-initiator tRNA complex (eIF2 ternary CC complex). Interacts with EIF4G1; in specific 5'-UTR length and AUG CC context (PubMed:29987188). Interacts with EIF5; which in a mutual CC exclusive interaction associates either with EIF1 or with EIF2S2 on a CC common binding site (PubMed:22813744). Interacts with RENT2 CC (PubMed:11073994). {ECO:0000269|PubMed:11073994, CC ECO:0000269|PubMed:29987188}. CC -!- INTERACTION: CC P41567; Q14152: EIF3A; NbExp=2; IntAct=EBI-726200, EBI-366617; CC P41567; Q99613: EIF3C; NbExp=2; IntAct=EBI-726200, EBI-353741; CC -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000305}. CC -!- SIMILARITY: Belongs to the SUI1 family. {ECO:0000305}. CC --------------------------------------------------------------------------- CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms CC Distributed under the Creative Commons Attribution (CC BY 4.0) License CC --------------------------------------------------------------------------- DR EMBL; L26247; AAA60602.1; -; mRNA. DR EMBL; AF083441; AAD52028.1; -; mRNA. DR EMBL; AF100737; AAD19900.1; -; mRNA. DR EMBL; BC005118; AAH05118.1; -; mRNA. DR EMBL; BC008710; AAH08710.1; -; mRNA. DR CCDS; CCDS11403.1; -. DR PIR; JC2042; JC2042. DR RefSeq; NP_005792.1; NM_005801.4. DR PDB; 2IF1; NMR; -; A=1-113. DR PDB; 4KZX; X-ray; 7.81 A; l=1-113. DR PDB; 4KZY; X-ray; 7.01 A; l=1-113. DR PDB; 6YBW; EM; 3.10 A; p=1-113. DR PDB; 6ZMW; EM; 3.70 A; p=1-113. DR PDB; 6ZP4; EM; 2.90 A; Z=1-113. DR PDB; 6ZVJ; EM; 3.80 A; N=23-113. DR PDB; 7A09; EM; 3.50 A; Z=1-113. DR PDB; 7QP6; EM; 4.70 A; p=1-113. DR PDB; 8PJ1; EM; 3.40 A; p=1-113. DR PDB; 8PPK; EM; 2.98 A; p=1-113. DR PDB; 8PPL; EM; 2.65 A; Ip=1-113. DR PDB; 8XXN; EM; 3.60 A; C1=1-113. DR PDB; 9BLN; EM; 3.90 A; W=1-113. DR PDB; 9NPX; EM; 2.10 A; k=1-113. DR AlphaFoldDB; P41567; -. DR BMRB; P41567; -. DR EMDB; EMD-10775; -. DR EMDB; EMD-11302; -. DR EMDB; EMD-11335; -. DR EMDB; EMD-11458; -. DR EMDB; EMD-11602; -. DR EMDB; EMD-14113; -. DR EMDB; EMD-17696; -. DR EMDB; EMD-17804; -. DR EMDB; EMD-17805; -. DR EMDB; EMD-38754; -. DR EMDB; EMD-44671; -. DR EMDB; EMD-49635; -. DR EMDB; EMD-49637; -. DR SMR; P41567; -. DR BioGRID; 115504; 45. DR DIP; DIP-50783N; -. DR FunCoup; P41567; 1968. DR IntAct; P41567; 17. DR NDEx; IQUERY-CP-EIF1; 2 NDEx IQuery Curated Pathways. DR STRING; 9606.ENSP00000419449; -. DR GlyCosmos; P41567; 1 site, 1 glycan. DR GlyGen; P41567; 2 sites, 1 N-linked glycan (1 site), 1 O-linked glycan (1 site). DR iPTMnet; P41567; -. DR PhosphoSitePlus; P41567; -. DR BioMuta; EIF1; -. DR jPOST; P41567; -. DR MassIVE; P41567; -. DR PaxDb; 9606-ENSP00000419449; -. DR PeptideAtlas; P41567; -. DR ProteomicsDB; 55464; -. DR Pumba; P41567; -. DR TopDownProteomics; P41567; -. DR Antibodypedia; 28894; 242 antibodies from 31 providers. DR DNASU; 10209; -. DR Ensembl; ENST00000469257.2; ENSP00000419449.1; ENSG00000173812.12. DR GeneID; 10209; -. DR KEGG; hsa:10209; -. DR MANE-Select; ENST00000469257.2; ENSP00000419449.1; NM_005801.4; NP_005792.1. DR AGR; HGNC:3249; -. DR ClinPGx; PA27683; -. DR CTD; 10209; -. DR DisGeNET; 10209; -. DR GeneCards; EIF1; -. DR HGNC; HGNC:3249; EIF1. DR HPA; ENSG00000173812; Low tissue specificity. DR MIM; 619901; gene. DR OpenTargets; ENSG00000173812; -. DR VEuPathDB; HostDB:ENSG00000173812; -. DR eggNOG; KOG1770; Eukaryota. DR GeneTree; ENSGT00390000015789; -. DR HOGENOM; CLU_082805_3_0_1; -. DR InParanoid; P41567; -. DR OMA; ACKMEFA; -. DR OrthoDB; 10248435at2759; -. DR PAN-GO; P41567; 4 GO annotations based on evolutionary models. DR PhylomeDB; P41567; -. DR PathwayCommons; P41567; -. DR SignaLink; P41567; -. DR SIGNOR; P41567; -. DR Agora; ENSG00000173812; -. DR BioGRID-ORCS; 10209; 723 hits in 1162 CRISPR screens. DR CD-CODE; DEE660B4; Stress granule. DR ChiTaRS; EIF1; human. DR EvolutionaryTrace; P41567; -. DR GeneWiki; EIF1; -. DR GenomeRNAi; 10209; -. DR Pharos; P41567; Tbio. DR PRO; PR:P41567; -. DR Proteomes; UP000005640; Chromosome 17. DR RNAct; P41567; protein. DR Bgee; ENSG00000173812; Expressed in sperm and 207 other cell types or tissues. DR ExpressionAtlas; P41567; baseline and differential. DR GO; GO:0005737; C:cytoplasm; IDA:UniProtKB. DR GO; GO:0016282; C:eukaryotic 43S preinitiation complex; IDA:UniProtKB. DR GO; GO:0033290; C:eukaryotic 48S preinitiation complex; IDA:UniProtKB. DR GO; GO:0043614; C:multi-eIF complex; IDA:UniProtKB. DR GO; GO:0005634; C:nucleus; IDA:UniProtKB. DR GO; GO:0043024; F:ribosomal small subunit binding; IDA:UniProtKB. DR GO; GO:0003723; F:RNA binding; HDA:UniProtKB. DR GO; GO:0008135; F:translation factor activity, RNA binding; TAS:ProtInc. DR GO; GO:0003743; F:translation initiation factor activity; IDA:UniProtKB. DR GO; GO:0006446; P:regulation of translational initiation; IDA:CACAO. DR GO; GO:0006413; P:translational initiation; IDA:UniProtKB. DR CDD; cd11566; eIF1_SUI1; 1. DR DisProt; DP00910; -. DR FunFam; 3.30.780.10:FF:000003; Eukaryotic translation initiation factor 1b; 1. DR Gene3D; 3.30.780.10; SUI1-like domain; 1. DR InterPro; IPR001950; SUI1. DR InterPro; IPR036877; SUI1_dom_sf. DR InterPro; IPR005874; SUI1_euk. DR NCBIfam; TIGR01160; SUI1_MOF2; 1. DR PANTHER; PTHR10388; EUKARYOTIC TRANSLATION INITIATION FACTOR SUI1; 1. DR Pfam; PF01253; SUI1; 1. DR PIRSF; PIRSF004499; SUI1_euk; 1. DR SUPFAM; SSF55159; eIF1-like; 1. DR PROSITE; PS50296; SUI1; 1. PE 1: Evidence at protein level; KW 3D-structure; Acetylation; Cytoplasm; Initiation factor; Phosphoprotein; KW Protein biosynthesis; Proteomics identification; Reference proteome. FT INIT_MET 1 FT /note="Removed" FT /evidence="ECO:0007744|PubMed:19413330, FT ECO:0007744|PubMed:20068231, ECO:0007744|PubMed:21406692" FT CHAIN 2..113 FT /note="Eukaryotic translation initiation factor 1" FT /id="PRO_0000130554" FT SITE 41 FT /note="Binds 40S ribosomal subunit" FT /evidence="ECO:0000305|PubMed:29987188" FT SITE 65 FT /note="Binds 40S ribosomal subunit" FT /evidence="ECO:0000305|PubMed:29987188" FT MOD_RES 2 FT /note="N-acetylserine" FT /evidence="ECO:0007744|PubMed:19413330, FT ECO:0007744|PubMed:20068231, ECO:0007744|PubMed:21406692" FT MOD_RES 2 FT /note="Phosphoserine" FT /evidence="ECO:0007744|PubMed:23186163" FT MOD_RES 9 FT /note="Phosphoserine" FT /evidence="ECO:0007744|PubMed:21406692, FT ECO:0007744|PubMed:23186163" FT VARIANT 59 FT /note="L -> P (in dbSNP:rs3390)" FT /id="VAR_052505" FT VARIANT 90 FT /note="R -> G (in dbSNP:rs3387)" FT /id="VAR_052506" FT MUTAGEN 57..58 FT /note="KK->AA: Decrease in interaction with EIF4G1." FT /evidence="ECO:0000269|PubMed:29987188" FT MUTAGEN 109..111 FT /note="KVH->AVA: Decrease in interaction with EIF4G1." FT /evidence="ECO:0000269|PubMed:29987188" FT CONFLICT 31 FT /note="I -> V (in Ref. 3; AAD19900)" FT /evidence="ECO:0000305" FT CONFLICT 62 FT /note="A -> P (in Ref. 3; AAD19900)" FT /evidence="ECO:0000305" FT TURN 6..9 FT /evidence="ECO:0007829|PDB:8PJ1" FT TURN 15..17 FT /evidence="ECO:0007829|PDB:8PPL" FT STRAND 20..23 FT /evidence="ECO:0007829|PDB:6ZP4" FT HELIX 24..28 FT /evidence="ECO:0007829|PDB:8PJ1" FT STRAND 33..37 FT /evidence="ECO:0007829|PDB:9NPX" FT STRAND 38..41 FT /evidence="ECO:0007829|PDB:2IF1" FT STRAND 43..47 FT /evidence="ECO:0007829|PDB:9NPX" FT STRAND 52..54 FT /evidence="ECO:0007829|PDB:6YBW" FT HELIX 58..67 FT /evidence="ECO:0007829|PDB:9NPX" FT STRAND 71..73 FT /evidence="ECO:0007829|PDB:9NPX" FT TURN 77..79 FT /evidence="ECO:0007829|PDB:8PPL" FT STRAND 83..87 FT /evidence="ECO:0007829|PDB:9NPX" FT HELIX 90..97 FT /evidence="ECO:0007829|PDB:9NPX" FT STRAND 100..102 FT /evidence="ECO:0007829|PDB:6ZP4" FT TURN 105..107 FT /evidence="ECO:0007829|PDB:8PPL" FT STRAND 108..112 FT /evidence="ECO:0007829|PDB:8PPL" SQ SEQUENCE 113 AA; 12732 MW; A7BC7F9B53FFEB2C CRC64; MSAIQNLHSF DPFADASKGD DLLPAGTEDY IHIRIQQRNG RKTLTTVQGI ADDYDKKKLV KAFKKKFACN GTVIEHPEYG EVIQLQGDQR KNICQFLVEI GLAKDDQLKV HGF //