ID MTNA_CROS5 Reviewed; 345 AA.
AC B1WQH2;
DT 16-DEC-2008, integrated into UniProtKB/Swiss-Prot.
DT 16-DEC-2008, sequence version 2.
DT 24-JAN-2024, entry version 70.
DE RecName: Full=Methylthioribose-1-phosphate isomerase {ECO:0000255|HAMAP-Rule:MF_01678};
DE Short=M1Pi {ECO:0000255|HAMAP-Rule:MF_01678};
DE Short=MTR-1-P isomerase {ECO:0000255|HAMAP-Rule:MF_01678};
DE EC=5.3.1.23 {ECO:0000255|HAMAP-Rule:MF_01678};
DE AltName: Full=S-methyl-5-thioribose-1-phosphate isomerase {ECO:0000255|HAMAP-Rule:MF_01678};
GN Name=mtnA {ECO:0000255|HAMAP-Rule:MF_01678}; OrderedLocusNames=cce_2333;
OS Crocosphaera subtropica (strain ATCC 51142 / BH68) (Cyanothece sp. (strain
OS ATCC 51142)).
OC Bacteria; Cyanobacteriota; Cyanophyceae; Oscillatoriophycideae;
OC Chroococcales; Aphanothecaceae; Crocosphaera; Crocosphaera subtropica.
OX NCBI_TaxID=43989;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC 51142 / BH68;
RX PubMed=18812508; DOI=10.1073/pnas.0805418105;
RA Welsh E.A., Liberton M., Stoeckel J., Loh T., Elvitigala T., Wang C.,
RA Wollam A., Fulton R.S., Clifton S.W., Jacobs J.M., Aurora R., Ghosh B.K.,
RA Sherman L.A., Smith R.D., Wilson R.K., Pakrasi H.B.;
RT "The genome of Cyanothece 51142, a unicellular diazotrophic cyanobacterium
RT important in the marine nitrogen cycle.";
RL Proc. Natl. Acad. Sci. U.S.A. 105:15094-15099(2008).
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_01678}.
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_01678};
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_01678}.
CC -!- SIMILARITY: Belongs to the eIF-2B alpha/beta/delta subunits family.
CC MtnA subfamily. {ECO:0000305}.
CC -!- SEQUENCE CAUTION:
CC Sequence=ACB51683.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR EMBL; CP000806; ACB51683.1; ALT_INIT; Genomic_DNA.
DR RefSeq; WP_035857660.1; NC_010546.1.
DR AlphaFoldDB; B1WQH2; -.
DR SMR; B1WQH2; -.
DR STRING; 43989.cce_2333; -.
DR KEGG; cyt:cce_2333; -.
DR eggNOG; COG0182; Bacteria.
DR HOGENOM; CLU_016218_1_2_3; -.
DR OrthoDB; 9803436at2; -.
DR UniPathway; UPA00904; UER00874.
DR Proteomes; UP000001203; Chromosome circular.
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; 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; Isomerase; Methionine biosynthesis;
KW Reference proteome.
FT CHAIN 1..345
FT /note="Methylthioribose-1-phosphate isomerase"
FT /id="PRO_0000357169"
FT ACT_SITE 240
FT /note="Proton donor"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01678"
FT BINDING 47..49
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01678"
FT BINDING 90
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01678"
FT BINDING 199
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01678"
FT BINDING 250..251
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01678"
FT SITE 160
FT /note="Transition state stabilizer"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01678"
SQ SEQUENCE 345 AA; 37939 MW; 43F6E2692F41B200 CRC64;
MNTIYPVIWS NNKVLLIDQT SLPSRYTLVE ISRYEDMAKA IKTMIVRGAP AIGVAAAYGM
YLGARDIQTQ DRETFLKHLD KIAQILRQTR PTAVNLFWAI SRMLKTAYET LGTVEEIKKI
LLETAQKIQE EDLQTCQAIG HNSLSILPTN PEKLTILTHC NAGALATAGY GTALGVIRSV
WTAGRLNRVF ADETRPRLQG AKLTAWECVQ EKIPVTVISD NMAAHCMQKG LIDMVVVGAD
RIAANGDTAN KIGTYGLAVI AKMHQVPFYV AAPLSTVDFS LETGDLIPIE ERDPSELYQI
GNTVIYPDGV DYYNPAFDVT PADLITGIIT EQKTVNPKEL ITLKG
//
