Cloning and expression of a Ca(2+)-inhibitable adenylyl cyclase from NCB-20 cells - PubMed (original) (raw)

Comparative Study

Cloning and expression of a Ca(2+)-inhibitable adenylyl cyclase from NCB-20 cells

M Yoshimura et al. Proc Natl Acad Sci U S A. 1992.

Abstract

A cDNA that encodes an adenylyl cyclase [ATP pyrophosphate-lyase (cyclizing), EC 4.6.1.1] has been cloned from NCB-20 cells, in which adenylyl cyclase activity is inhibited by Ca2+ at physiological concentrations. The cDNA clone (5.8 kilobases) was isolated by polymerase chain reaction (PCR) using degenerate primers designed by comparison of three adenylyl cyclase sequences (types I, II, and III) and subsequent library screening. Northern analysis revealed expression of mRNA (6.1 kilobases) corresponding to this cDNA in cardiac tissue, which is a prominent source of Ca(2+)-inhibitable adenylyl cyclase. The clone encodes a protein of 1165 amino acids, whose hydrophilicity profile was very similar to those of other mammalian adenylyl cyclases that have recently been cloned. A noticeable difference between this protein and other adenylyl cyclases was a lengthy aminoterminal region before the first transmembrane span. Transient expression of this cDNA in the human embryonic kidney cell line 293 revealed a 3-fold increase in cAMP production in response to forskolin compared with control transfected cells. In purified plasma membranes from transfected cells, increased adenylyl cyclase activity was also detected, which was susceptible to inhibition by submicromolar Ca2+. Thus, this adenylyl cyclase seems to represent the Ca(2+)-inhibitable form that is encountered in NCB-20 cells, cardiac tissue, and elsewhere. Its identification should permit a determination of the structural features that determine the mode of regulation of adenylyl cyclase by Ca2+.

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Cloning and expression of a Ca(2+)-inhibitable adenylyl cyclase from NCB-20 cells - PubMed (original) (raw)