ID   MTNA_PYRTR              Reviewed;         392 AA.
AC   B2VZQ8;
DT   30-NOV-2010, integrated into UniProtKB/Swiss-Prot.
DT   01-JUL-2008, sequence version 1.
DT   25-MAY-2022, entry version 57.
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; ORFNames=PTRG_02898;
OS   Pyrenophora tritici-repentis (strain Pt-1C-BFP) (Wheat tan spot fungus)
OS   (Drechslera tritici-repentis).
OC   Eukaryota; Fungi; Dikarya; Ascomycota; Pezizomycotina; Dothideomycetes;
OC   Pleosporomycetidae; Pleosporales; Pleosporineae; Pleosporaceae;
OC   Pyrenophora.
OX   NCBI_TaxID=426418;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=Pt-1C-BFP;
RX   PubMed=23316438; DOI=10.1534/g3.112.004044;
RA   Manning V.A., Pandelova I., Dhillon B., Wilhelm L.J., Goodwin S.B.,
RA   Berlin A.M., Figueroa M., Freitag M., Hane J.K., Henrissat B., Holman W.H.,
RA   Kodira C.D., Martin J., Oliver R.P., Robbertse B., Schackwitz W.,
RA   Schwartz D.C., Spatafora J.W., Turgeon B.G., Yandava C., Young S., Zhou S.,
RA   Zeng Q., Grigoriev I.V., Ma L.-J., Ciuffetti L.M.;
RT   "Comparative genomics of a plant-pathogenic fungus, Pyrenophora tritici-
RT   repentis, reveals transduplication and the impact of repeat elements on
RT   pathogenicity and population divergence.";
RL   G3 (Bethesda) 3:41-63(2013).
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; DS231616; EDU45421.1; -; Genomic_DNA.
DR   RefSeq; XP_001933231.1; XM_001933196.1.
DR   AlphaFoldDB; B2VZQ8; -.
DR   SMR; B2VZQ8; -.
DR   STRING; 45151.EDU45421; -.
DR   EnsemblFungi; EDU45421; EDU45421; PTRG_02898.
DR   GeneID; 6341122; -.
DR   eggNOG; KOG1468; Eukaryota.
DR   HOGENOM; CLU_016218_1_3_1; -.
DR   InParanoid; B2VZQ8; -.
DR   OMA; RLWVDET; -.
DR   OrthoDB; 1410886at2759; -.
DR   UniPathway; UPA00904; UER00874.
DR   Proteomes; UP000001471; Unassembled WGS sequence.
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..392
FT                   /note="Methylthioribose-1-phosphate isomerase"
FT                   /id="PRO_0000402046"
FT   ACT_SITE        253
FT                   /note="Proton donor"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_03119"
FT   SITE            169
FT                   /note="Transition state stabilizer"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_03119"
SQ   SEQUENCE   392 AA;  41504 MW;  E9D487F2393354A5 CRC64;
     MVLQAIKYSR GQLEILDQLK LPHAEEYDHI YSSTDAWHAI KEMRTRGAPA IAIVAALALA
     VELSNMKLPS VAEEVKVFIT EKLDYLVTSR PTAVNLADAA GKLQRITESA AASEGADGDS
     VREAYVSAAE KMLVDDVSDN ESIGKHGAEW IMKNTEAGKK GPVSMMTHCN TGSLATAGYG
     TALGVIRSLH SAGSLKHAFC SETRPYNQGS RLTAFELVHD KIPATLITDS MAAALLRLRG
     ESENIAGIVV GADRVAANGD TANKIGTYSL AILAKHHGVK FLVAAPRTTI DLKTKSGADI
     VIEERSGKEV TLVKGPRHDG VTLDLGVIET ISIAANGIGV WNPAFDVTPA ELIDGIITEV
     GVVEKDSNGV FHLDTVFKAE GSEVKPSTIG GL