MTAP_CERS4
ID MTAP_CERS4 Reviewed; 290 AA.
AC Q3J5E8;
DT 25-JAN-2012, integrated into UniProtKB/Swiss-Prot.
DT 08-NOV-2005, sequence version 1.
DT 03-AUG-2022, entry version 83.
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}; OrderedLocusNames=RHOS4_04180;
GN ORFNames=RSP_1837;
OS Cereibacter sphaeroides (strain ATCC 17023 / DSM 158 / JCM 6121 / CCUG
OS 31486 / LMG 2827 / NBRC 12203 / NCIMB 8253 / ATH 2.4.1.) (Rhodobacter
OS sphaeroides).
OC Bacteria; Proteobacteria; Alphaproteobacteria; Rhodobacterales;
OC Rhodobacteraceae; Cereibacter.
OX NCBI_TaxID=272943;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC 17023 / DSM 158 / JCM 6121 / CCUG 31486 / LMG 2827 / NBRC 12203
RC / NCIMB 8253 / ATH 2.4.1.;
RA Copeland A., Lucas S., Lapidus A., Barry K., Detter J.C., Glavina T.,
RA Hammon N., Israni S., Pitluck S., Richardson P., Mackenzie C.,
RA Choudhary M., Larimer F., Hauser L.J., Land M., Donohue T.J., Kaplan S.;
RT "Complete sequence of chromosome 1 of Rhodobacter sphaeroides 2.4.1.";
RL Submitted (SEP-2005) to the EMBL/GenBank/DDBJ databases.
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; CP000143; ABA77986.1; -; Genomic_DNA.
DR RefSeq; WP_011337020.1; NZ_CP030271.1.
DR RefSeq; YP_351887.1; NC_007493.2.
DR AlphaFoldDB; Q3J5E8; -.
DR SMR; Q3J5E8; -.
DR STRING; 272943.RSP_1837; -.
DR EnsemblBacteria; ABA77986; ABA77986; RSP_1837.
DR KEGG; rsp:RSP_1837; -.
DR PATRIC; fig|272943.9.peg.724; -.
DR eggNOG; COG0005; Bacteria.
DR OMA; ADPFCPE; -.
DR PhylomeDB; Q3J5E8; -.
DR UniPathway; UPA00904; UER00873.
DR Proteomes; UP000002703; Chromosome 1.
DR GO; GO:0017061; F:S-methyl-5-thioadenosine phosphorylase activity; IEA:UniProtKB-UniRule.
DR GO; GO:0019509; P:L-methionine salvage from methylthioadenosine; IEA:UniProtKB-UniRule.
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; -; 1.
DR HAMAP; MF_01963; MTAP; 1.
DR InterPro; IPR010044; MTAP.
DR InterPro; IPR000845; Nucleoside_phosphorylase_d.
DR InterPro; IPR035994; Nucleoside_phosphorylase_sf.
DR PANTHER; PTHR42679; PTHR42679; 1.
DR Pfam; PF01048; PNP_UDP_1; 1.
DR SUPFAM; SSF53167; SSF53167; 1.
DR TIGRFAMs; TIGR01694; MTAP; 1.
PE 3: Inferred from homology;
KW Glycosyltransferase; Purine salvage; Reference proteome; Transferase.
FT CHAIN 1..290
FT /note="S-methyl-5'-thioadenosine phosphorylase"
FT /id="PRO_0000415098"
FT BINDING 11
FT /ligand="phosphate"
FT /ligand_id="ChEBI:CHEBI:43474"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01963"
FT BINDING 53..54
FT /ligand="phosphate"
FT /ligand_id="ChEBI:CHEBI:43474"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01963"
FT BINDING 86..87
FT /ligand="phosphate"
FT /ligand_id="ChEBI:CHEBI:43474"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01963"
FT BINDING 184
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01963"
FT BINDING 185
FT /ligand="phosphate"
FT /ligand_id="ChEBI:CHEBI:43474"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01963"
FT BINDING 208..210
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01963"
FT SITE 166
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 290 AA; 30950 MW; 35B46FAB615584CF CRC64;
MKTMIGVIGG SGVYEIDGLE DAVWTKVETP WGDPSDEILT GRLDGVPMAF LPRHGRGHVH
SPTTVPYRAN IDALKRLGVT DLVSVSACGS FREEMAPGDF VIVDQFIDRS FARAKSFFGS
GCVAHVSLAH PTCGRLSALC AEAARATGVT VHEGGTYLCM EGPQFSTLAE SLLYKSWGCH
VIGMTNMPEA KLAREAEICY ASVAMVTDYD SWHPHHGEVD ITAIIATLGT NADHARGLVA
GLPARLGTER DLCPHGCDRA LDHALMTAPA KRDPELLAKL DAVAGRVLKG
