Article ID Journal Published Year Pages File Type
70093 Journal of Molecular Catalysis B: Enzymatic 2013 7 Pages PDF
Abstract

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).

Graphical abstractcAMP from ATP by adenylate cyclase from Pyrococcus furiosus.Figure optionsDownload full-size imageDownload 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.

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Physical Sciences and Engineering Chemical Engineering Catalysis
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