Reviewed, UniProtKB/Swiss-Prot Q7VKK0 (MTNN_HAEDU)

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:	HD_1898

Organism

Haemophilus ducreyi [Complete proteome] [HAMAP]

Taxonomic identifier

730 [NCBI]

Taxonomic lineage

Bacteria › Proteobacteria › Gammaproteobacteria › Pasteurellales › Pasteurellaceae › Haemophilus

Protein attributes

Sequence length	232 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 – 232	232	5'-methylthioadenosine/S-adenosylhomocysteine nucleosidase HAMAP MF_01684		PRO_0000359304
Regions
	Region	175 – 176	2	Substrate binding By similarity
Sites
	Active site	14	1	Proton acceptor By similarity
	Binding site	80	1	Substrate; via amide nitrogen By similarity
	Binding site	199	1	Substrate By similarity

Sequences

	Sequence		Length	Mass (Da)
	Q7VKK0-1 [UniParc]. Last modified October 1, 2003. Version 1. Checksum: 0E4CF08EE55400B2	FASTA	232	24,766
	10 20 30 40 50 60 MKLKIGIIGA MAQEIEILRK LMTDVSVLEI AGCKIYEGKI NNTCVSLLQS GIGKVSAAMG 70 80 90 100 110 120 TTLLLELTKP NMVINTGSAG GLAENLNVGD IVISTEVRHY DVDVTAFGYE IGQLPANPAA 130 140 150 160 170 180 FLPNEQLVNM ALKETKTAGV NAVAGLICSG DRFVNGAEQI TTIRQHFDQV VAVEMEAAAI 190 200 210 220 230 AQVCYAFEVP FVVVRAISDI ADKCSHLSFE EFLPLAAEKS SEIVIAMLNN FS

References

[1]

"The complete genome sequence of Haemophilus ducreyi." Munson R.S. Jr., Ray W.C., Mahairas G., Sabo P., Mungur R., Johnson L., Nguyen D., Wang J., Forst C., Hood L. Submitted (JUN-2003) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. Strain: 35000HP / ATCC 700724.

Cross-references

Sequence databases
EMBLGenBankDDBJ	AE017143 Genomic DNA. Translation: AAP96627.1.
RefSeq	NP_874238.1.
3D structure databases
HSSP	HSSP built from PDB template 1JYS based on UniProtKB P24247.
ModBase	Search...
Genome annotation databases
GeneID	1491735.
GenomeReviews	Gene locus HD_1898 in contig AE017143_GR.
KEGG	hdu:HD1898.
NMPDR	fig|233412.1.peg.1603.
Organism-specific databases
CMR	Search...
Phylogenomic databases
HOGENOM	Q7VKK0.
OMA	AQVCHQF.
Enzyme and pathway databases
BioCyc	HDUC233412:HD_1898-MON.
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_HAEDU

Accession

Primary (citable) accession number: Q7VKK0

Entry history

Integrated into UniProtKB/Swiss-Prot:	January 20, 2009
Last sequence update:	October 1, 2003
Last modified:	November 3, 2009
This is version 35 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)