title: A novel serralysin metalloprotease from Deinococcus radiodurans.
abstract: A hypothetical protein (DR2310) from the radiation resistant organism Deinococcus radiodurans harbors highly conserved Zn+2-binding (HEXXH) domain and Met-turn (SVMSY), characteristic of the serralysin family of secreted metalloproteases from Gram negative bacteria. Deletion mutagenesis of DR2310 confirmed that the ORF is expressed in Deinococcus radiodurans as a secreted protease of 85 kDa. Biochemical analysis revealed DR2310 to be a Ca+2 and Zn+2-requiring metalloprotease. Unique features such as a long N-terminus, replacement of the highly conserved C-terminal glycine rich Ca+2-binding repeats with a single N-terminal aspartate rich eukaryotic thrombospondin type-3 Ca+2-binding repeat and absence of C-terminal secretion signals make it a novel member of serralysin family. This is the first report of a functional serralysin family metalloprotease from a Gram positive organism.
authors.affiliation: Molecular Biology Division, Bhabha Atomic Research Centre, Mumbai - 400085, India.
authors.forename: Bhakti
authors.initials: B
authors.lastname: Basu
authors.forename: Shree Kumar
authors.initials: SK
authors.lastname: Apte
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D001483:Base Sequence; D001665:Binding Sites / Q000235:genetics; D002118:Calcium / Q000378:metabolism; D019295:Computational Biology; D017124:Conserved Sequence; D004269:DNA, Bacterial / Q000235:genetics; D034301:Deinococcus / Q000201:enzymology* / Q000235:genetics; D008666:Metalloendopeptidases / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D016296:Mutagenesis; D010802:Phylogeny; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D017384:Sequence Deletion; D017386:Sequence Homology, Amino Acid; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D015032:Zinc / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D011994:Recombinant Proteins; D008666:Metalloendopeptidases; C095666:serralysin; D015032:Zinc; D002118:Calcium