Reviewed, UniProtKB/Swiss-Prot B1YJD6 (MTNN_EXIS2)

Names and origin

Protein names

Recommended name:
    5'-methylthioadenosine/S-adenosylhomocysteine nucleosidase
      Short name=MTA/SAH nucleosidase
      Short name=MTAN
    EC=3.2.2.9
Alternative name(s):
    5'-methylthioadenosine nucleosidase
      Short name=MTA nucleosidase
    S-adenosylhomocysteine nucleosidase
      Short name=SAH nucleosidase
      Short name=AdoHcy nucleosidase
      Short name=SRH nucleosidase

Gene names

Name:	mtnN
Ordered Locus Names:	Exig_2065

Organism

Exiguobacterium sibiricum (strain DSM 17290 / JCM 13490 / 255-15) [Complete proteome] [HAMAP]

Taxonomic identifier

262543 [NCBI]

Taxonomic lineage

Bacteria › Firmicutes › Bacillales › Bacillales Family XII. Incertae Sedis › Exiguobacterium

Protein attributes

Sequence length	234 AA.
Sequence status	Complete.
Sequence processing	The displayed sequence is not processed.
Protein existence	Inferred from homology.

General annotation (Comments)

Function	Catalyzes the irreversible cleavage of the glycosidic bond in both 5'-methylthioadenosine (MTA) and S-adenosylhomocysteine (SAH/AdoHcy) to adenine and the corresponding thioribose, 5'-methylthioribose and S-ribosylhomocysteine, respectively By similarity.
Catalytic activity	S-adenosyl-L-homocysteine + H2O = S-(5-deoxy-D-ribos-5-yl)-L-homocysteine + adenine. HAMAP MF_01684 S-methyl-5'-thioadenosine + H2O = S-methyl-5-thio-D-ribose + adenine. HAMAP MF_01684
Pathway	Amino-acid biosynthesis; L-methionine biosynthesis via salvage pathway; S-methyl-5-thio-alpha-D-ribose 1-phosphate from S-methyl-5'-thioadenosine (hydrolase route): step 1/2. HAMAP MF_01684
Sequence similarities	Belongs to the PNP/UDP phosphorylase family. MtnN subfamily.

Ontologies

Keywords
Biological process	Amino-acid biosynthesis Methionine biosynthesis
Molecular function	Hydrolase
Technical term	Complete proteome
Gene Ontology (GO)
Biological process	methionine biosynthetic process from S-adenosylmethionine Inferred from electronic annotation. Source: HAMAP methionine salvage Inferred from electronic annotation. Source: InterPro nucleoside catabolic process Inferred from electronic annotation. Source: InterPro
Molecular function	adenosylhomocysteine nucleosidase activity Inferred from electronic annotation. Source: HAMAP methylthioadenosine nucleosidase activity Inferred from electronic annotation. Source: HAMAP
Complete GO annotation...

Sequence annotation (Features)

	Feature key	Position(s)	Length	Description	Graphical view	Feature identifier
Molecule processing
	Chain	1 – 234	234	5'-methylthioadenosine/S-adenosylhomocysteine nucleosidase HAMAP MF_01684		PRO_0000359301
Regions
	Region	174 – 175	2	Substrate binding By similarity
Sites
	Active site	12	1	Proton acceptor By similarity
	Binding site	78	1	Substrate; via amide nitrogen By similarity
	Binding site	153	1	Substrate; via amide nitrogen and carbonyl oxygen By similarity
	Binding site	198	1	Substrate By similarity

Sequences

	Sequence		Length	Mass (Da)
	B1YJD6-1 [UniParc]. Last modified May 20, 2008. Version 1. Checksum: 0D085FC35E1381EC	FASTA	234	25,234
	10 20 30 40 50 60 MPIAIIGAME EEVNLLRNEL SERKDTVIAN YHFYEGLLNS VPVVILKSGI GKVNAAIGTT 70 80 90 100 110 120 LLLDHFKPSS VINTGSAGGF RAGLKVGDVV VSTEVRHHDV DVTAFGYEYG QVPGMPAAYT 130 140 150 160 170 180 ADPKLIATAE AVIERMDAIR VVHGLIVTGD SFIHDTERSN LIKTNFPDVA AVEMEAAPIA 190 200 210 220 230 QVCHQFDVPF VVTRSISDSA DEEASLSFDE FLEIASINSA KMVMEVVRTL ADSE

References

[1]

"Complete sequence of chromosome of Exiguobacterium sibiricum 255-15." Copeland A., Lucas S., Lapidus A., Glavina del Rio T., Dalin E., Tice H., Bruce D., Goodwin L., Pitluck S., Kiss H., Chertkov O., Monk C., Brettin T., Detter J.C., Han C., Kuske C.R., Schmutz J., Larimer F. , Land M., Hauser L., Kyrpides N., Mikhailova N., Vishnivetskaya T., Rodrigues D.F., Gilichinsky D., Tiedje J., Richardson P. Submitted (APR-2008) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].

Cross-references

Sequence databases
EMBLGenBankDDBJ	CP001022 Genomic DNA. Translation: ACB61517.1.
RefSeq	YP_001814534.1.
3D structure databases
ModBase	Search...
Genome annotation databases
GeneID	6173265.
GenomeReviews	Gene locus Exig_2065 in contig CP001022_GR.
KEGG	esi:Exig_2065.
Organism-specific databases
CMR	Search...
Phylogenomic databases
OMA	AQVCHQF.
Family and domain databases
HAMAP	MF_01684. [Tree]
InterPro	IPR010049. MTA_SAH_Nsdase. IPR000845. Nucleoside_phosphorylase. IPR018017. Nucleoside_phosphorylase_1. [Graphical view]
PANTHER	PTHR21234. PNP_UDP. 1 hit.
Pfam	PF01048. PNP_UDP_1. 1 hit. [Graphical view]
TIGRFAMs	TIGR01704. MTA/SAH-Nsdase. 1 hit.
ProtoNet	Search...

Entry information

Entry name

MTNN_EXIS2

Accession

Primary (citable) accession number: B1YJD6

Entry history

Integrated into UniProtKB/Swiss-Prot:	January 20, 2009
Last sequence update:	May 20, 2008
Last modified:	November 3, 2009
This is version 13 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation project

HAMAP (High-quality Automated and Manual Annotation of microbial Proteomes)