ID   SAHH_CHLTE              Reviewed;         471 AA.
AC   Q8KEG8;
DT   25-MAR-2003, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-2002, sequence version 1.
DT   03-AUG-2022, entry version 119.
DE   RecName: Full=Adenosylhomocysteinase {ECO:0000255|HAMAP-Rule:MF_00563};
DE            EC=3.3.1.1 {ECO:0000255|HAMAP-Rule:MF_00563};
DE   AltName: Full=S-adenosyl-L-homocysteine hydrolase {ECO:0000255|HAMAP-Rule:MF_00563};
DE            Short=AdoHcyase {ECO:0000255|HAMAP-Rule:MF_00563};
GN   Name=ahcY {ECO:0000255|HAMAP-Rule:MF_00563}; Synonyms=sahH;
GN   OrderedLocusNames=CT0721;
OS   Chlorobaculum tepidum (strain ATCC 49652 / DSM 12025 / NBRC 103806 / TLS)
OS   (Chlorobium tepidum).
OC   Bacteria; Chlorobi; Chlorobia; Chlorobiales; Chlorobiaceae; Chlorobaculum.
OX   NCBI_TaxID=194439;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 49652 / DSM 12025 / NBRC 103806 / TLS;
RX   PubMed=12093901; DOI=10.1073/pnas.132181499;
RA   Eisen J.A., Nelson K.E., Paulsen I.T., Heidelberg J.F., Wu M., Dodson R.J.,
RA   DeBoy R.T., Gwinn M.L., Nelson W.C., Haft D.H., Hickey E.K., Peterson J.D.,
RA   Durkin A.S., Kolonay J.F., Yang F., Holt I.E., Umayam L.A., Mason T.M.,
RA   Brenner M., Shea T.P., Parksey D.S., Nierman W.C., Feldblyum T.V.,
RA   Hansen C.L., Craven M.B., Radune D., Vamathevan J.J., Khouri H.M.,
RA   White O., Gruber T.M., Ketchum K.A., Venter J.C., Tettelin H., Bryant D.A.,
RA   Fraser C.M.;
RT   "The complete genome sequence of Chlorobium tepidum TLS, a photosynthetic,
RT   anaerobic, green-sulfur bacterium.";
RL   Proc. Natl. Acad. Sci. U.S.A. 99:9509-9514(2002).
CC   -!- FUNCTION: May play a key role in the regulation of the intracellular
CC       concentration of adenosylhomocysteine. {ECO:0000255|HAMAP-
CC       Rule:MF_00563}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=H2O + S-adenosyl-L-homocysteine = adenosine + L-homocysteine;
CC         Xref=Rhea:RHEA:21708, ChEBI:CHEBI:15377, ChEBI:CHEBI:16335,
CC         ChEBI:CHEBI:57856, ChEBI:CHEBI:58199; EC=3.3.1.1;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00563};
CC   -!- COFACTOR:
CC       Name=NAD(+); Xref=ChEBI:CHEBI:57540;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00563};
CC       Note=Binds 1 NAD(+) per subunit. {ECO:0000255|HAMAP-Rule:MF_00563};
CC   -!- PATHWAY: Amino-acid biosynthesis; L-homocysteine biosynthesis; L-
CC       homocysteine from S-adenosyl-L-homocysteine: step 1/1.
CC       {ECO:0000255|HAMAP-Rule:MF_00563}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_00563}.
CC   -!- SIMILARITY: Belongs to the adenosylhomocysteinase family.
CC       {ECO:0000255|HAMAP-Rule:MF_00563}.
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DR   EMBL; AE006470; AAM71958.1; -; Genomic_DNA.
DR   RefSeq; NP_661616.1; NC_002932.3.
DR   RefSeq; WP_010932403.1; NC_002932.3.
DR   AlphaFoldDB; Q8KEG8; -.
DR   SMR; Q8KEG8; -.
DR   STRING; 194439.CT0721; -.
DR   EnsemblBacteria; AAM71958; AAM71958; CT0721.
DR   KEGG; cte:CT0721; -.
DR   PATRIC; fig|194439.7.peg.661; -.
DR   eggNOG; COG0499; Bacteria.
DR   HOGENOM; CLU_025194_2_1_10; -.
DR   OMA; NKYGCRE; -.
DR   OrthoDB; 522981at2; -.
DR   UniPathway; UPA00314; UER00076.
DR   Proteomes; UP000001007; Chromosome.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0004013; F:adenosylhomocysteinase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0006730; P:one-carbon metabolic process; IEA:UniProtKB-UniRule.
DR   CDD; cd00401; SAHH; 1.
DR   Gene3D; 3.40.50.1480; -; 1.
DR   HAMAP; MF_00563; AdoHcyase; 1.
DR   InterPro; IPR042172; Adenosylhomocyst_ase-like_sf.
DR   InterPro; IPR000043; Adenosylhomocysteinase-like.
DR   InterPro; IPR015878; Ado_hCys_hydrolase_NAD-bd.
DR   InterPro; IPR036291; NAD(P)-bd_dom_sf.
DR   InterPro; IPR020082; S-Ado-L-homoCys_hydrolase_CS.
DR   PANTHER; PTHR23420; PTHR23420; 1.
DR   Pfam; PF05221; AdoHcyase; 1.
DR   Pfam; PF00670; AdoHcyase_NAD; 1.
DR   PIRSF; PIRSF001109; Ad_hcy_hydrolase; 1.
DR   SMART; SM00996; AdoHcyase; 1.
DR   SMART; SM00997; AdoHcyase_NAD; 1.
DR   SUPFAM; SSF51735; SSF51735; 1.
DR   TIGRFAMs; TIGR00936; ahcY; 1.
DR   PROSITE; PS00738; ADOHCYASE_1; 1.
DR   PROSITE; PS00739; ADOHCYASE_2; 1.
PE   3: Inferred from homology;
KW   Cytoplasm; Hydrolase; NAD; One-carbon metabolism; Reference proteome.
FT   CHAIN           1..471
FT                   /note="Adenosylhomocysteinase"
FT                   /id="PRO_0000116956"
FT   BINDING         60
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00563"
FT   BINDING         135
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00563"
FT   BINDING         196
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00563"
FT   BINDING         197..199
FT                   /ligand="NAD(+)"
FT                   /ligand_id="ChEBI:CHEBI:57540"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00563"
FT   BINDING         226
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00563"
FT   BINDING         230
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00563"
FT   BINDING         231
FT                   /ligand="NAD(+)"
FT                   /ligand_id="ChEBI:CHEBI:57540"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00563"
FT   BINDING         260..265
FT                   /ligand="NAD(+)"
FT                   /ligand_id="ChEBI:CHEBI:57540"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00563"
FT   BINDING         283
FT                   /ligand="NAD(+)"
FT                   /ligand_id="ChEBI:CHEBI:57540"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00563"
FT   BINDING         318
FT                   /ligand="NAD(+)"
FT                   /ligand_id="ChEBI:CHEBI:57540"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00563"
FT   BINDING         339..341
FT                   /ligand="NAD(+)"
FT                   /ligand_id="ChEBI:CHEBI:57540"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00563"
FT   BINDING         387
FT                   /ligand="NAD(+)"
FT                   /ligand_id="ChEBI:CHEBI:57540"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00563"
SQ   SEQUENCE   471 AA;  51949 MW;  31B082405D241047 CRC64;
     MTTEAAVLDY KVADISLAEW GRKEIEIAEK EMPGLMATRK KYEGKKPLAG ARIAGSLHMT
     IQTAVLIETL VELGADVRWA SCNIFSTQDH AAAAIAAAGV PVFAWKGETL DEYWWCTRQI
     LEFEGGLGPN LIVDDGGDAT LMIHFGYKIE NDPSMLDKTP GNAEEKALLQ QLKAVFAEDN
     QRWHKVAAGM KGVSEETTTG VHRLYQMMEK GELLFPAINV NDSVTKSKFD NLYGCRESLA
     DGIKRATDVM IAGKVVVVLG YGDVGKGCAH SMRSYGARVI VTEIDPICAL QAAMEGFEVT
     TMEEAVKEGN IFVTATGNKD VITLDHIKQM RDEAIVCNIG HFDNEIQVDA LNNFKGATRI
     NIKPQVDKYV FENGNCIYLL AEGRLVNLGC ATGHPSFVMS NSFTNQTLAQ IELWQNDYKV
     GVYRLPKKLD EEVARLHLGQ IGAKLTTLTK EQADYIGVPV EGPYKPEHYR Y