pH sensing via bicarbonate-regulated "soluble" adenylyl cyclase (sAC).

pH sensing via bicarbonate-regulated "soluble" adenylyl cyclase (sAC).
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DOI:
10.3389/fphys.2013.00343
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发表时间:
2013-11-25
影响因子:
4
通讯作者:
Levin LR
Levin LR
中科院分区:
医学2区
文献类型:
--
作者:
Rahman N;Buck J;Levin LR

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可溶性腺苷酸环化酶(sAC)是第二信使环磷酸腺苷(cAMP)的来源。sAC由碳酸氢根(HCO−3)离子直接调节。在活细胞中,由于碳酸酐酶的普遍存在,HCO−3离子与二氧化碳(CO2)和pH几乎处于瞬时平衡状态。许多生物过程都受到CO2、HCO−3和/或pH值的调节,在其中一些生物过程中,sAC被证明是一种生理CO2/HCO 3/pH传感器。在这篇综述中,我们详细介绍了已知的pH传感功能的sAC,我们讨论了两个高度研究,pH依赖性途径,其中sAC可能发挥作用。
Soluble adenylyl cyclase (sAC) is a source of the second messenger cyclic adenosine 3′, 5′ monophosphate (cAMP). sAC is directly regulated by bicarbonate (HCO−3) ions. In living cells, HCO−3 ions are in nearly instantaneous equilibrium with carbon dioxide (CO2) and pH due to the ubiquitous presence of carbonic anhydrases. Numerous biological processes are regulated by CO2, HCO−3, and/or pH, and in a number of these, sAC has been shown to function as a physiological CO2/HCO3/pH sensor. In this review, we detail the known pH sensing functions of sAC, and we discuss two highly-studied, pH-dependent pathways in which sAC might play a role.
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