ID A0A3N4IKW8_ASCIM Unreviewed; 376 AA.
AC A0A3N4IKW8;
DT 13-FEB-2019, integrated into UniProtKB/TrEMBL.
DT 13-FEB-2019, sequence version 1.
DT 13-SEP-2023, entry version 16.
DE RecName: Full=Methylthioribose-1-phosphate isomerase {ECO:0000256|HAMAP-Rule:MF_03119};
DE Short=M1Pi {ECO:0000256|HAMAP-Rule:MF_03119};
DE Short=MTR-1-P isomerase {ECO:0000256|HAMAP-Rule:MF_03119};
DE EC=5.3.1.23 {ECO:0000256|HAMAP-Rule:MF_03119};
DE AltName: Full=S-methyl-5-thioribose-1-phosphate isomerase {ECO:0000256|HAMAP-Rule:MF_03119};
DE AltName: Full=Translation initiation factor eIF-2B subunit alpha/beta/delta-like protein {ECO:0000256|HAMAP-Rule:MF_03119};
GN Name=MRI1 {ECO:0000256|HAMAP-Rule:MF_03119};
GN ORFNames=BJ508DRAFT_323338 {ECO:0000313|EMBL:RPA84780.1};
OS Ascobolus immersus RN42.
OC Eukaryota; Fungi; Dikarya; Ascomycota; Pezizomycotina; Pezizomycetes;
OC Pezizales; Ascobolaceae; Ascobolus.
OX NCBI_TaxID=1160509 {ECO:0000313|EMBL:RPA84780.1, ECO:0000313|Proteomes:UP000275078};
RN [1] {ECO:0000313|EMBL:RPA84780.1, ECO:0000313|Proteomes:UP000275078}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=RN42 {ECO:0000313|EMBL:RPA84780.1,
RC ECO:0000313|Proteomes:UP000275078};
RX PubMed=30420746; DOI=10.1038/s41559-018-0710-4;
RA Murat C., Payen T., Noel B., Kuo A., Morin E., Chen J., Kohler A.,
RA Krizsan K., Balestrini R., Da Silva C., Montanini B., Hainaut M.,
RA Levati E., Barry K.W., Belfiori B., Cichocki N., Clum A., Dockter R.B.,
RA Fauchery L., Guy J., Iotti M., Le Tacon F., Lindquist E.A., Lipzen A.,
RA Malagnac F., Mello A., Molinier V., Miyauchi S., Poulain J., Riccioni C.,
RA Rubini A., Sitrit Y., Splivallo R., Traeger S., Wang M., Zifcakova L.,
RA Wipf D., Zambonelli A., Paolocci F., Nowrousian M., Ottonello S.,
RA Baldrian P., Spatafora J.W., Henrissat B., Nagy L.G., Aury J.M.,
RA Wincker P., Grigoriev I.V., Bonfante P., Martin F.M.;
RT "Pezizomycetes genomes reveal the molecular basis of ectomycorrhizal
RT truffle lifestyle.";
RL Nat. Ecol. Evol. 2:1956-1965(2018).
CC -!- FUNCTION: Catalyzes the interconversion of methylthioribose-1-phosphate
CC (MTR-1-P) into methylthioribulose-1-phosphate (MTRu-1-P).
CC {ECO:0000256|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:0000256|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:0000256|HAMAP-Rule:MF_03119}.
CC -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000256|HAMAP-Rule:MF_03119}.
CC Nucleus {ECO:0000256|HAMAP-Rule:MF_03119}.
CC -!- SIMILARITY: Belongs to the eIF-2B alpha/beta/delta subunits family.
CC MtnA subfamily. {ECO:0000256|HAMAP-Rule:MF_03119}.
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DR EMBL; ML119657; RPA84780.1; -; Genomic_DNA.
DR AlphaFoldDB; A0A3N4IKW8; -.
DR STRING; 1160509.A0A3N4IKW8; -.
DR UniPathway; UPA00904; UER00874.
DR Proteomes; UP000275078; 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:0003743; F:translation initiation factor activity; IEA:UniProtKB-KW.
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; translation initiation factor eif-2b, domain 1; 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 NCBIfam; TIGR00524; eIF-2B_rel; 1.
DR NCBIfam; TIGR00512; salvage_mtnA; 1.
DR PANTHER; PTHR43475; METHYLTHIORIBOSE-1-PHOSPHATE ISOMERASE; 1.
DR PANTHER; PTHR43475:SF1; METHYLTHIORIBOSE-1-PHOSPHATE ISOMERASE; 1.
DR Pfam; PF01008; IF-2B; 1.
DR SUPFAM; SSF100950; NagB/RpiA/CoA transferase-like; 1.
PE 3: Inferred from homology;
KW Amino-acid biosynthesis {ECO:0000256|ARBA:ARBA00022605, ECO:0000256|HAMAP-
KW Rule:MF_03119}; Cytoplasm {ECO:0000256|HAMAP-Rule:MF_03119};
KW Initiation factor {ECO:0000313|EMBL:RPA84780.1};
KW Isomerase {ECO:0000256|ARBA:ARBA00023235, ECO:0000256|HAMAP-Rule:MF_03119};
KW Methionine biosynthesis {ECO:0000256|ARBA:ARBA00023167, ECO:0000256|HAMAP-
KW Rule:MF_03119}; Nucleus {ECO:0000256|HAMAP-Rule:MF_03119};
KW Protein biosynthesis {ECO:0000313|EMBL:RPA84780.1};
KW Reference proteome {ECO:0000313|Proteomes:UP000275078}.
FT ACT_SITE 254
FT /note="Proton donor"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_03119"
FT SITE 170
FT /note="Transition state stabilizer"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_03119"
SQ SEQUENCE 376 AA; 40119 MW; 846DDB23575F6CC2 CRC64;
MTDAASKLKA IDYTRGSLRI LDQLLLPHQT VYLDITNSEQ AWSAIRTMQT RGAPAIAIVA
VLALAVDLHT TASTFTTSTS VRDYINTKLD YLVTSRPTAV NLADAVQKLK TIIDASPSTT
SASDLINLYI TSAESLLASD ITDNTSIGSH GSGWLLSQLS GRPATVLTHC NTGSLATAGY
GTALGIIRSL HSSGNLTHAY CTETRPYNQG SRLTAYELVQ EGMPATLITD SMVTSLLTDV
NVKNKPDAII VGADRVARNG DTANKIGTHQ LAILARHFGI KFIVAAPTTT IDLDTKEGAD
IVIEQRPAEE VKIVKGLLVG GEGELAEVVV APKEIGVYNP SFDVTPWKYI DAVVTEKGVV
ERGENGFDFS GVFVKQ
//
