期刊
JOURNAL OF PLANT PHYSIOLOGY
卷 165, 期 13, 页码 1360-1369出版社
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2007.10.012
关键词
alternative oxidase; Arum spp.; K-ATP(+) channel; mitochondria; thermogenesis
资金
- University of Udine
This report demonstrates that mitochondria isolated from thermogenic Arum spadices possess an ATP-sensitive potassium channel responsible for electrical potential (Delta psi) collapse and mitochondrial swelling whose characteristics are similar to those previously described in pea and wheat mitochondria. In order to study the relationship between this K-ATP(+) channel and the uncoupled respiration, Linked to thermogenesis, K' transport activities were compared with those of mitochondria that were isolated from pea stems, soybean suspension cell cultures and Arum tubers. The channel from Arum spadices is highly active and its major features are (i) potassium flux is performed primarily in an inward-rectifying manner; (ii) the influx of K+ is associated with a matrix volume increase in both energized and non-energized mitochondria; and (iii) its activity depends on the redox state of electron transport chain (ETC) and oxygen availability. In particular, this paper shows that the K-ATP(+) channel is inwardly activated in parallel with the alternative oxidase (AO). The activation is linked to an ETC-oxidized state and to high oxygen consumption. The putative role of this K-ATP(+) channel is discussed in relation to flowering of thermogenic Arum spaclices. (c) 2007 Elsevier GmbH. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据