کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
70093 | 48810 | 2013 | 7 صفحه PDF | دانلود رایگان |

In this paper, two genes that encoded two soluble type IV adenylyl cyclases (AC) from the hyperthermophilic archaeon Pyrococcus furiosus (PFAC I and PFAC II) were cloned and expressed in Escherichia coli (E. coli) BL21 (DE3). Amino acid sequence analysis of the two enzymes showed 29% homology. PFAC I and PFAC II were both Mn2+ activated enzyme. They were purified by His-trap chromatography and had a specific activity of 3.1 × 103 U/mg at pH 10.0, 95 °C (PFAC I) and 2.0 × 103 U/mg at pH 11.0, 95 °C (PFAC II), respectively. The Km and kcat of PFAC I was 1.38 mM and 1.11 s−1. The Km and kcat of PFAC II was 1.44 mM and 0.80 s−1. The thermostability of PFAC I and PFAC II were higher than the soluble type IV adenylyl cyclases from Yersinia pestis (YpAC-IV). All of the properties suggested that these two adenylyl cyclases may be useful for the industrial producing of cyclic adenosine 3′,5′-monophosphate (cAMP).
cAMP from ATP by adenylate cyclase from Pyrococcus furiosus.Figure optionsDownload as PowerPoint slideHighlights
► Two type IV adenylyl cyclases from Pyrococcus furiosus have been expressed and characterized in this work.
► Both enzymes are Mg2+ activated and the optimal temperature of them is 95 °C.
► The specific activity of PFAC I and PFAC II are 3.1 × 103 U/mg and 2.0 × 103 U/mg.
Journal: Journal of Molecular Catalysis B: Enzymatic - Volume 88, April 2013, Pages 7–13