Reviewed, UniProtKB/Swiss-Prot B0URX4 (MTNN_HAES2)

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:	HSM_0529

Organism

Haemophilus somnus (strain 2336) (Histophilus somni (strain 2336)) [Complete proteome] [HAMAP]

Taxonomic identifier

228400 [NCBI]

Taxonomic lineage

Bacteria › Proteobacteria › Gammaproteobacteria › Pasteurellales › Pasteurellaceae › Histophilus

Protein attributes

Sequence length	229 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 – 229	229	5'-methylthioadenosine/S-adenosylhomocysteine nucleosidase HAMAP MF_01684		PRO_0000359309
Regions
	Region	173 – 174	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	152	1	Substrate; via amide nitrogen and carbonyl oxygen By similarity
	Binding site	197	1	Substrate By similarity

Sequences

	Sequence		Length	Mass (Da)
	B0URX4-1 [UniParc]. Last modified April 8, 2008. Version 1. Checksum: 14AEC72AA8FA8C79	FASTA	229	24,023
	10 20 30 40 50 60 MKVGIVGAMA QEVEILASLI ENKNVVHIAG CTIYQGNIQD KEVALLQSGI GKVAAAMGTT 70 80 90 100 110 120 LLLQMFKPDI VINTGSAGGV SSGLKVGDVV VSTQTVYHDA DVTAFGYAKG QLPACPPAFI 130 140 150 160 170 180 SDPKLTALVE NVAEQQGINL TSGLICSGDS FINSAEKLAW IKANFPEVVA IEMEATAIAQ 190 200 210 220 VCHKFNIPFV VIRAISDVGD GEASISFEEF LPLAARQSSS MVLKILQSL

References

[1]

"Complete sequence of Haemophilus somnus 2336." Siddaramappa S., Duncan A.J., Challacombe J.F., Rainey D., Gillaspy A.F., Carson M., Gipson J., Gipson M., Bruce D., Detter J.C., Han C.S., Land M., Tapia R., Thompson L.S., Orvis J., Zaitshik J., Barnes G., Brettin T.S., Dyer D.W., Inzana T.J. Submitted (FEB-2008) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].

Cross-references

Sequence databases
EMBLGenBankDDBJ	CP000947 Genomic DNA. Translation: ACA32179.1.
RefSeq	YP_001783873.1.
3D structure databases
ModBase	Search...
Genome annotation databases
GeneID	6108322.
GenomeReviews	Gene locus HSM_0529 in contig CP000947_GR.
KEGG	hsm:HSM_0529.
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_HAES2

Accession

Primary (citable) accession number: B0URX4

Entry history

Integrated into UniProtKB/Swiss-Prot:	January 20, 2009
Last sequence update:	April 8, 2008
Last modified:	November 3, 2009
This is version 11 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)