ID D7E8L4_METEZ Unreviewed; 411 AA.
AC D7E8L4;
DT 10-AUG-2010, integrated into UniProtKB/TrEMBL.
DT 10-AUG-2010, sequence version 1.
DT 27-MAR-2024, entry version 88.
DE RecName: Full=S-inosyl-L-homocysteine hydrolase {ECO:0000256|HAMAP-Rule:MF_00563};
DE Short=SIHH {ECO:0000256|HAMAP-Rule:MF_00563};
DE EC=3.13.1.9 {ECO:0000256|HAMAP-Rule:MF_00563};
GN OrderedLocusNames=Metev_0785 {ECO:0000313|EMBL:ADI73685.1};
OS Methanohalobium evestigatum (strain ATCC BAA-1072 / DSM 3721 / NBRC 107634
OS / OCM 161 / Z-7303).
OC Archaea; Euryarchaeota; Stenosarchaea group; Methanomicrobia;
OC Methanosarcinales; Methanosarcinaceae; Methanohalobium.
OX NCBI_TaxID=644295 {ECO:0000313|EMBL:ADI73685.1, ECO:0000313|Proteomes:UP000000391};
RN [1] {ECO:0000313|EMBL:ADI73685.1, ECO:0000313|Proteomes:UP000000391}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC BAA-1072 / DSM 3721 / NBRC 107634 / OCM 161 / Z-7303
RC {ECO:0000313|Proteomes:UP000000391};
RG US DOE Joint Genome Institute;
RA Lucas S., Copeland A., Lapidus A., Cheng J.-F., Bruce D., Goodwin L.,
RA Pitluck S., Saunders E., Detter J.C., Han C., Tapia R., Land M., Hauser L.,
RA Kyrpides N., Mikhailova N., Sieprawska-Lupa M., Whitman W.B., Anderson I.,
RA Woyke T.;
RT "Complete sequence chromosome of Methanohalobium evestigatum Z-7303.";
RL Submitted (JUN-2010) to the EMBL/GenBank/DDBJ databases.
CC -!- FUNCTION: Catalyzes the hydrolysis of S-inosyl-L-homocysteine (SIH) to
CC L-homocysteine (Hcy) and inosine. Likely functions in a S-adenosyl-L-
CC methionine (SAM) recycling pathway from S-adenosyl-L-homocysteine (SAH)
CC produced from SAM-dependent methylation reactions. Can also catalyze
CC the reverse reaction in vitro, i.e. the synthesis of SIH from Hcy and
CC inosine. {ECO:0000256|HAMAP-Rule:MF_00563}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=H2O + S-inosyl-L-homocysteine = inosine + L-homocysteine;
CC Xref=Rhea:RHEA:59828, ChEBI:CHEBI:15377, ChEBI:CHEBI:17596,
CC ChEBI:CHEBI:57985, ChEBI:CHEBI:58199; EC=3.13.1.9;
CC Evidence={ECO:0000256|HAMAP-Rule:MF_00563};
CC -!- COFACTOR:
CC Name=NAD(+); Xref=ChEBI:CHEBI:57540;
CC Evidence={ECO:0000256|HAMAP-Rule:MF_00563,
CC ECO:0000256|PIRSR:PIRSR001109-2};
CC Note=Binds 1 NAD(+) per subunit. {ECO:0000256|HAMAP-Rule:MF_00563,
CC ECO:0000256|PIRSR:PIRSR001109-2};
CC -!- PATHWAY: Amino-acid biosynthesis; S-adenosyl-L-methionine biosynthesis.
CC {ECO:0000256|HAMAP-Rule:MF_00563}.
CC -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000256|HAMAP-Rule:MF_00563}.
CC -!- MISCELLANEOUS: SAH is a product of SAM methyltransferases and is known
CC to be a feedback inhibitor of these enzymes. As a result of this
CC inhibition, organisms have evolved efficient enzymes to metabolize SAH
CC via different pathways. The pathway found in methanogens differs from
CC the canonical pathway, it uses the deamination of S-adenosyl-L-
CC homocysteine to form S-inosyl-L-homocysteine for the regeneration of
CC SAM from S-adenosyl-L-homocysteine. {ECO:0000256|HAMAP-Rule:MF_00563}.
CC -!- SIMILARITY: Belongs to the adenosylhomocysteinase family.
CC {ECO:0000256|ARBA:ARBA00007122, ECO:0000256|HAMAP-Rule:MF_00563,
CC ECO:0000256|RuleBase:RU004166}.
CC -!- CAUTION: Lacks conserved residue(s) required for the propagation of
CC feature annotation. {ECO:0000256|HAMAP-Rule:MF_00563}.
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DR EMBL; CP002069; ADI73685.1; -; Genomic_DNA.
DR RefSeq; WP_013194253.1; NC_014253.1.
DR AlphaFoldDB; D7E8L4; -.
DR STRING; 644295.Metev_0785; -.
DR GeneID; 9346410; -.
DR KEGG; mev:Metev_0785; -.
DR HOGENOM; CLU_025194_0_2_2; -.
DR OrthoDB; 8479at2157; -.
DR UniPathway; UPA00315; -.
DR Proteomes; UP000000391; Chromosome.
DR GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR GO; GO:0016802; F:trialkylsulfonium hydrolase activity; IEA:UniProtKB-UniRule.
DR GO; GO:0006730; P:one-carbon metabolic process; IEA:UniProtKB-UniRule.
DR GO; GO:0006556; P:S-adenosylmethionine biosynthetic process; IEA:UniProtKB-UniPathway.
DR CDD; cd00401; SAHH; 1.
DR Gene3D; 3.40.50.1480; Adenosylhomocysteinase-like; 1.
DR Gene3D; 3.40.50.720; NAD(P)-binding Rossmann-like Domain; 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 NCBIfam; TIGR00936; ahcY; 1.
DR PANTHER; PTHR23420; ADENOSYLHOMOCYSTEINASE; 1.
DR PANTHER; PTHR23420:SF0; ADENOSYLHOMOCYSTEINASE; 1.
DR Pfam; PF05221; AdoHcyase; 2.
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; SSF52283; Formate/glycerate dehydrogenase catalytic domain-like; 1.
DR SUPFAM; SSF51735; NAD(P)-binding Rossmann-fold domains; 1.
DR PROSITE; PS00738; ADOHCYASE_1; 1.
DR PROSITE; PS00739; ADOHCYASE_2; 1.
PE 3: Inferred from homology;
KW Cytoplasm {ECO:0000256|HAMAP-Rule:MF_00563};
KW Hydrolase {ECO:0000256|HAMAP-Rule:MF_00563, ECO:0000313|EMBL:ADI73685.1};
KW NAD {ECO:0000256|ARBA:ARBA00023027, ECO:0000256|HAMAP-Rule:MF_00563};
KW One-carbon metabolism {ECO:0000256|ARBA:ARBA00022563, ECO:0000256|HAMAP-
KW Rule:MF_00563}; Reference proteome {ECO:0000313|Proteomes:UP000000391}.
FT DOMAIN 181..341
FT /note="S-adenosyl-L-homocysteine hydrolase NAD binding"
FT /evidence="ECO:0000259|SMART:SM00997"
FT BINDING 121
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00563"
FT BINDING 146
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00563"
FT BINDING 147..149
FT /ligand="NAD(+)"
FT /ligand_id="ChEBI:CHEBI:57540"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00563,
FT ECO:0000256|PIRSR:PIRSR001109-2"
FT BINDING 176
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00563"
FT BINDING 180
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00563"
FT BINDING 181
FT /ligand="NAD(+)"
FT /ligand_id="ChEBI:CHEBI:57540"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00563"
FT BINDING 210..215
FT /ligand="NAD(+)"
FT /ligand_id="ChEBI:CHEBI:57540"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00563"
FT BINDING 212..217
FT /ligand="NAD(+)"
FT /ligand_id="ChEBI:CHEBI:57540"
FT /evidence="ECO:0000256|PIRSR:PIRSR001109-2"
FT BINDING 233
FT /ligand="NAD(+)"
FT /ligand_id="ChEBI:CHEBI:57540"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00563,
FT ECO:0000256|PIRSR:PIRSR001109-2"
FT BINDING 268
FT /ligand="NAD(+)"
FT /ligand_id="ChEBI:CHEBI:57540"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00563"
FT BINDING 289..291
FT /ligand="NAD(+)"
FT /ligand_id="ChEBI:CHEBI:57540"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00563,
FT ECO:0000256|PIRSR:PIRSR001109-2"
FT BINDING 335
FT /ligand="NAD(+)"
FT /ligand_id="ChEBI:CHEBI:57540"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00563,
FT ECO:0000256|PIRSR:PIRSR001109-2"
FT BINDING 342
FT /ligand="NAD(+)"
FT /ligand_id="ChEBI:CHEBI:57540"
FT /evidence="ECO:0000256|PIRSR:PIRSR001109-2"
SQ SEQUENCE 411 AA; 45181 MW; 40FDACAA6BFAD024 CRC64;
MVDDTLLESG NQKIEWARNH MPVLSIIRDG FASEKPLKGC RIAMALHVEA KTAVLVETLA
SGGAEIAITG CNPLSTQDDV AAALDTRDNV SCYAKNDVSK DEYYEAIDRV LDIEPNIIVD
DGADIIHKIH TERQNLLPNV IGGCEETTTG VHRLMSMSEN NALKIPTIAV NDALTKFLFD
NRYGTGQSTW DAINRTTNLL VAGKDVVVAG YGWCGKGVAM YAAGLGANVI VTEVNPVRAL
EARMDGYRVM TMDEAAELGD IFVTTTGNVS VLTRDHFKLM KDGVILANSG HFNVEMNLEE
LESMAHSIRK VKSNIKEYNL KTHRINVIAD QQTVNLAAGD GHPAEVMDMS FSNQALCVRH
LVDNDLDIDV HAVPPEIDTY IAELKLKVLG IEIDELTTEQ EKYMREWEHG T
//
