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Zinc inhibition of adenylyl cyclase correlates with conformational changes in the enzyme

机译:锌对腺苷酸环化酶的抑制作用与酶的构象变化有关

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We have previously demonstrated that Zn2+ inhibits hormone and forskolin stimulation of cAMP synthesis in intact N18TG2 cells, corresponding plasma membranes, and of recombinant adenylyl cyclase isoforms. If, however, the enzyme is pre-activated by hormone or forskolin, Zn2+ inhibition is attenuated [J. Biol. Chem. 277 (2002) 11859]. We have extended our analyses of this inhibition to investigations of soluble adenylyl cyclase, composed of the CI and CII domains of the full-length protein. The properties of Zn2+ inhibition of the soluble enzyme parallel that of the full-length protein, including the fact that inhibition is not competitive with Mg2+. By monitoring intrinsic and extrinsic fluorescence, we demonstrate changes in enzyme conformers in response to the addition of varied effectors. The data suggest a possible mechanism by which Zn2+ inhibits adenylyl cyclase activity. (C) 2004 Elsevier Inc. All rights reserved.
机译:先前我们已经证明Zn2 +在完整的N18TG2细胞,相应的质膜和重组腺苷酸环化酶同工型中抑制激素和毛喉素刺激cAMP合成。但是,如果该酶被激素或毛喉素预先激活,对Zn2 +的抑制作用就会减弱[J.生物学化学277(2002)11859]。我们已经将这种抑制作用的分析扩展到可溶性腺苷酸环化酶的研究,可溶性腺苷酸环化酶由全长蛋白的CI和CII结构域组成。 Zn2 +对可溶性酶的抑制作用与全长蛋白质的抑制作用平行,包括抑制作用与Mg2 +不竞争这一事实。通过监视内在和外在荧光,我们证明响应各种效应物的添加,酶构象变化。数据表明Zn2 +抑制腺苷酸环化酶活性的可能机制。 (C)2004 Elsevier Inc.保留所有权利。

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