ID   MTNA_KOMPG              Reviewed;         411 AA.
AC   C4QYS6;
DT   30-NOV-2010, integrated into UniProtKB/Swiss-Prot.
DT   07-JUL-2009, sequence version 1.
DT   25-MAY-2022, entry version 66.
DE   RecName: Full=Methylthioribose-1-phosphate isomerase {ECO:0000255|HAMAP-Rule:MF_03119};
DE            Short=M1Pi {ECO:0000255|HAMAP-Rule:MF_03119};
DE            Short=MTR-1-P isomerase {ECO:0000255|HAMAP-Rule:MF_03119};
DE            EC=5.3.1.23 {ECO:0000255|HAMAP-Rule:MF_03119};
DE   AltName: Full=S-methyl-5-thioribose-1-phosphate isomerase {ECO:0000255|HAMAP-Rule:MF_03119};
DE   AltName: Full=Translation initiation factor eIF-2B subunit alpha/beta/delta-like protein {ECO:0000255|HAMAP-Rule:MF_03119};
GN   Name=MRI1 {ECO:0000255|HAMAP-Rule:MF_03119};
GN   OrderedLocusNames=PAS_chr1-4_0545;
OS   Komagataella phaffii (strain GS115 / ATCC 20864) (Yeast) (Pichia pastoris).
OC   Eukaryota; Fungi; Dikarya; Ascomycota; Saccharomycotina; Saccharomycetes;
OC   Saccharomycetales; Phaffomycetaceae; Komagataella.
OX   NCBI_TaxID=644223;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=GS115 / ATCC 20864;
RX   PubMed=19465926; DOI=10.1038/nbt.1544;
RA   De Schutter K., Lin Y.-C., Tiels P., Van Hecke A., Glinka S.,
RA   Weber-Lehmann J., Rouze P., Van de Peer Y., Callewaert N.;
RT   "Genome sequence of the recombinant protein production host Pichia
RT   pastoris.";
RL   Nat. Biotechnol. 27:561-566(2009).
CC   -!- FUNCTION: Catalyzes the interconversion of methylthioribose-1-phosphate
CC       (MTR-1-P) into methylthioribulose-1-phosphate (MTRu-1-P).
CC       {ECO:0000255|HAMAP-Rule:MF_03119}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=S-methyl-5-thio-alpha-D-ribose 1-phosphate = S-methyl-5-thio-
CC         D-ribulose 1-phosphate; Xref=Rhea:RHEA:19989, ChEBI:CHEBI:58533,
CC         ChEBI:CHEBI:58548; EC=5.3.1.23; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_03119};
CC   -!- PATHWAY: Amino-acid biosynthesis; L-methionine biosynthesis via salvage
CC       pathway; L-methionine from S-methyl-5-thio-alpha-D-ribose 1-phosphate:
CC       step 1/6. {ECO:0000255|HAMAP-Rule:MF_03119}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_03119}.
CC       Nucleus {ECO:0000255|HAMAP-Rule:MF_03119}.
CC   -!- SIMILARITY: Belongs to the eIF-2B alpha/beta/delta subunits family.
CC       MtnA subfamily. {ECO:0000255|HAMAP-Rule:MF_03119}.
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DR   EMBL; FN392319; CAY68400.1; -; Genomic_DNA.
DR   RefSeq; XP_002490680.1; XM_002490635.1.
DR   AlphaFoldDB; C4QYS6; -.
DR   SMR; C4QYS6; -.
DR   STRING; 644223.C4QYS6; -.
DR   EnsemblFungi; CAY68400; CAY68400; PAS_chr1-4_0545.
DR   GeneID; 8197676; -.
DR   KEGG; ppa:PAS_chr1-4_0545; -.
DR   eggNOG; KOG1468; Eukaryota.
DR   HOGENOM; CLU_016218_1_3_1; -.
DR   InParanoid; C4QYS6; -.
DR   OMA; RLWVDET; -.
DR   UniPathway; UPA00904; UER00874.
DR   Proteomes; UP000000314; Chromosome 1.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0005634; C:nucleus; IEA:UniProtKB-SubCell.
DR   GO; GO:0046523; F:S-methyl-5-thioribose-1-phosphate isomerase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0019509; P:L-methionine salvage from methylthioadenosine; IEA:UniProtKB-UniPathway.
DR   GO; GO:0019284; P:L-methionine salvage from S-adenosylmethionine; IEA:UniProtKB-UniRule.
DR   Gene3D; 1.20.120.420; -; 1.
DR   Gene3D; 3.40.50.10470; -; 1.
DR   HAMAP; MF_01678; Salvage_MtnA; 1.
DR   InterPro; IPR000649; IF-2B-related.
DR   InterPro; IPR005251; IF-M1Pi.
DR   InterPro; IPR042529; IF_2B-like_C.
DR   InterPro; IPR011559; Initiation_fac_2B_a/b/d.
DR   InterPro; IPR027363; M1Pi_N.
DR   InterPro; IPR037171; NagB/RpiA_transferase-like.
DR   Pfam; PF01008; IF-2B; 1.
DR   SUPFAM; SSF100950; SSF100950; 1.
DR   TIGRFAMs; TIGR00524; eIF-2B_rel; 1.
DR   TIGRFAMs; TIGR00512; salvage_mtnA; 1.
PE   3: Inferred from homology;
KW   Amino-acid biosynthesis; Cytoplasm; Isomerase; Methionine biosynthesis;
KW   Nucleus; Reference proteome.
FT   CHAIN           1..411
FT                   /note="Methylthioribose-1-phosphate isomerase"
FT                   /id="PRO_0000402042"
FT   ACT_SITE        284
FT                   /note="Proton donor"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_03119"
FT   SITE            174
FT                   /note="Transition state stabilizer"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_03119"
SQ   SEQUENCE   411 AA;  45460 MW;  2735601719722C01 CRC64;
     MSLQAIKFDR QKTRLDILDQ LLIPYQTKYI QVSNIDDGYS VIQKMQVRGA PAIAIVGSFS
     ITCELNSVKD GQKNNHGYDV SDLSVFKAAL EKRIDYLIKS RPTAVNLVNA CTAIKAIVET
     ACTIDDLYAE VLRYSVVLFE DDLKNNYRIG ANGVRYIDNE LSNFEGPFAV MTICNTGSLA
     TSGHGTALGI IRSLWAKSKA NPRNADDKTI QGQKSWLSHV YACETRPYNQ GSRLTSYELN
     FEKIPFSLIT DNMPAYLIDS LFSQRVNCPL PSRAPVKFII VGADRIVTNG DLANKIGTFQ
     LALIASQYDG VKFIGAAPTT TIDYTRDSGD DIVIEQRPAN ELTSILGGQV DSSDQFVTDS
     EGKVNLLRIK TATPNIDVWN PAFDVTPNRL IDSIVTEQDY LVKDSHGKFN L