ID   MTAP_NITMS              Reviewed;         263 AA.
AC   A9A3N5;
DT   25-JAN-2012, integrated into UniProtKB/Swiss-Prot.
DT   15-JAN-2008, sequence version 1.
DT   27-MAR-2024, entry version 74.
DE   RecName: Full=S-methyl-5'-thioadenosine phosphorylase {ECO:0000255|HAMAP-Rule:MF_01963};
DE            EC=2.4.2.28 {ECO:0000255|HAMAP-Rule:MF_01963};
DE   AltName: Full=5'-methylthioadenosine phosphorylase {ECO:0000255|HAMAP-Rule:MF_01963};
DE            Short=MTA phosphorylase {ECO:0000255|HAMAP-Rule:MF_01963};
DE            Short=MTAP {ECO:0000255|HAMAP-Rule:MF_01963};
GN   Name=mtnP {ECO:0000255|HAMAP-Rule:MF_01963};
GN   OrderedLocusNames=Nmar_1401;
OS   Nitrosopumilus maritimus (strain SCM1).
OC   Archaea; Nitrososphaerota; Nitrososphaeria; Nitrosopumilales;
OC   Nitrosopumilaceae; Nitrosopumilus.
OX   NCBI_TaxID=436308;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=SCM1;
RX   PubMed=20421470; DOI=10.1073/pnas.0913533107;
RA   Walker C.B., de la Torre J.R., Klotz M.G., Urakawa H., Pinel N., Arp D.J.,
RA   Brochier-Armanet C., Chain P.S., Chan P.P., Gollabgir A., Hemp J.,
RA   Hugler M., Karr E.A., Konneke M., Shin M., Lawton T.J., Lowe T.,
RA   Martens-Habbena W., Sayavedra-Soto L.A., Lang D., Sievert S.M.,
RA   Rosenzweig A.C., Manning G., Stahl D.A.;
RT   "Nitrosopumilus maritimus genome reveals unique mechanisms for
RT   nitrification and autotrophy in globally distributed marine crenarchaea.";
RL   Proc. Natl. Acad. Sci. U.S.A. 107:8818-8823(2010).
CC   -!- FUNCTION: Catalyzes the reversible phosphorylation of S-methyl-5'-
CC       thioadenosine (MTA) to adenine and 5-methylthioribose-1-phosphate.
CC       Involved in the breakdown of MTA, a major by-product of polyamine
CC       biosynthesis. Responsible for the first step in the methionine salvage
CC       pathway after MTA has been generated from S-adenosylmethionine. Has
CC       broad substrate specificity with 6-aminopurine nucleosides as preferred
CC       substrates. {ECO:0000255|HAMAP-Rule:MF_01963}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=phosphate + S-methyl-5'-thioadenosine = adenine + S-methyl-5-
CC         thio-alpha-D-ribose 1-phosphate; Xref=Rhea:RHEA:11852,
CC         ChEBI:CHEBI:16708, ChEBI:CHEBI:17509, ChEBI:CHEBI:43474,
CC         ChEBI:CHEBI:58533; EC=2.4.2.28; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_01963};
CC   -!- PATHWAY: Amino-acid biosynthesis; L-methionine biosynthesis via salvage
CC       pathway; S-methyl-5-thio-alpha-D-ribose 1-phosphate from S-methyl-5'-
CC       thioadenosine (phosphorylase route): step 1/1. {ECO:0000255|HAMAP-
CC       Rule:MF_01963}.
CC   -!- SUBUNIT: Homohexamer. Dimer of a homotrimer. {ECO:0000255|HAMAP-
CC       Rule:MF_01963}.
CC   -!- SIMILARITY: Belongs to the PNP/MTAP phosphorylase family. MTAP
CC       subfamily. {ECO:0000255|HAMAP-Rule:MF_01963}.
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DR   EMBL; CP000866; ABX13297.1; -; Genomic_DNA.
DR   AlphaFoldDB; A9A3N5; -.
DR   SMR; A9A3N5; -.
DR   STRING; 436308.Nmar_1401; -.
DR   EnsemblBacteria; ABX13297; ABX13297; Nmar_1401.
DR   KEGG; nmr:Nmar_1401; -.
DR   eggNOG; arCOG01327; Archaea.
DR   HOGENOM; CLU_054456_0_2_2; -.
DR   InParanoid; A9A3N5; -.
DR   OrthoDB; 7681at2157; -.
DR   PhylomeDB; A9A3N5; -.
DR   UniPathway; UPA00904; UER00873.
DR   Proteomes; UP000000792; Chromosome.
DR   GO; GO:0005829; C:cytosol; IBA:GO_Central.
DR   GO; GO:0017061; F:S-methyl-5-thioadenosine phosphorylase activity; IBA:GO_Central.
DR   GO; GO:0019509; P:L-methionine salvage from methylthioadenosine; IBA:GO_Central.
DR   GO; GO:0006166; P:purine ribonucleoside salvage; IEA:UniProtKB-KW.
DR   CDD; cd09010; MTAP_SsMTAPII_like_MTIP; 1.
DR   Gene3D; 3.40.50.1580; Nucleoside phosphorylase domain; 1.
DR   HAMAP; MF_01963; MTAP; 1.
DR   InterPro; IPR010044; MTAP.
DR   InterPro; IPR000845; Nucleoside_phosphorylase_d.
DR   InterPro; IPR035994; Nucleoside_phosphorylase_sf.
DR   InterPro; IPR018099; Purine_phosphorylase-2_CS.
DR   NCBIfam; TIGR01694; MTAP; 1.
DR   PANTHER; PTHR42679; S-METHYL-5'-THIOADENOSINE PHOSPHORYLASE; 1.
DR   PANTHER; PTHR42679:SF3; S-METHYL-5'-THIOADENOSINE PHOSPHORYLASE; 1.
DR   Pfam; PF01048; PNP_UDP_1; 1.
DR   SUPFAM; SSF53167; Purine and uridine phosphorylases; 1.
DR   PROSITE; PS01240; PNP_MTAP_2; 1.
PE   3: Inferred from homology;
KW   Glycosyltransferase; Purine salvage; Reference proteome; Transferase.
FT   CHAIN           1..263
FT                   /note="S-methyl-5'-thioadenosine phosphorylase"
FT                   /id="PRO_0000415105"
FT   BINDING         13
FT                   /ligand="phosphate"
FT                   /ligand_id="ChEBI:CHEBI:43474"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01963"
FT   BINDING         55..56
FT                   /ligand="phosphate"
FT                   /ligand_id="ChEBI:CHEBI:43474"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01963"
FT   BINDING         88..89
FT                   /ligand="phosphate"
FT                   /ligand_id="ChEBI:CHEBI:43474"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01963"
FT   BINDING         186
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01963"
FT   BINDING         187
FT                   /ligand="phosphate"
FT                   /ligand_id="ChEBI:CHEBI:43474"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01963"
FT   BINDING         210..212
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01963"
FT   SITE            168
FT                   /note="Important for substrate specificity"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01963"
FT   SITE            221
FT                   /note="Important for substrate specificity"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01963"
SQ   SEQUENCE   263 AA;  29043 MW;  F42286B331B3BFF9 CRC64;
     MEKDVEIGIF GGTGIYDSGL LEDAKEVDID TPYGKPSDTI TVGTFKGRKI AFLPRHGKKH
     TIPPHMINFK ANIWAFKELG VTRIIAPSAV GSLKEELAPG HFVLPTQFLD FTKSRDGSFS
     EDGRVIHISV ADPFCPELQS SITEVTDSLD MNIHKDCTYV CIEGPRFSTK AESKFYRTTG
     ADIIGMTLVP ECQLAREAQI CYASISTVTD YDVWAEKPVT AKEVLETLSK NVEGTKKILT
     ELIEKIPKDR SCSCAKALEE AEF
//