کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2052969 | 1074249 | 2006 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Mammalian l-to-d-amino-acid-residue isomerase from platypus venom Mammalian l-to-d-amino-acid-residue isomerase from platypus venom](/preview/png/2052969.png)
The presence of d-amino-acid-containing polypeptides, defensin-like peptide (DLP)-2 and Ornithorhyncus venom C-type natriuretic peptide (OvCNP)b, in platypus venom suggested the existence of a mammalian d-amino-acid-residue isomerase(s) responsible for the modification of the all-l-amino acid precursors. We show here that this enzyme(s) is present in the venom gland extract and is responsible for the creation of DLP-2 from DLP-4 and OvCNPb from OvCNPa. The isomerisation reaction is freely reversible and under well defined laboratory conditions catalyses the interconversion of the DLPs to full equilibration. The isomerase is ∼50–60 kDa and is inhibited by methanol and the peptidase inhibitor amastatin. This is the first known l-to-d-amino-acid-residue isomerase in a mammal.
Journal: FEBS Letters - Volume 580, Issue 6, 6 March 2006, Pages 1587–1591