THE ROLE OF CALCIUM IN STALK DEVELOPMENT AND IN PHOSPHATE ACQUISITION IN CAULOBACTER-CRESCENTUS
THE ROLE OF CALCIUM IN STALK DEVELOPMENT AND IN PHOSPHATE ACQUISITION IN CAULOBACTER-CRESCENTUS
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DOI：
10.1007/bf00413014
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发表时间：
1984-01-01
影响因子：
2.8
通讯作者：
POINDEXTER, JS
中科院分区：
文献类型：
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作者：
POINDEXTER, JS
Ca2+刺激月牙藤茎部发育，减轻了磷酸盐对月牙藤茎部发育的抑制。这表明磷酸盐抑制可能归因于其与Ca2+的相互作用，从而剥夺了促进细胞发育的因子。Ca2+促进了细胞的磷酸盐获取，观察到在磷酸盐浓度极端情况下的生长加速，促进了c源的利用而不是储存，并支持磷酸盐依赖性抵抗砷酸盐抑制生长。分裂细胞的细胞学研究表明，有柄的兄弟姐妹有更多的外源磷酸盐用于生长或作为多磷酸盐储存，而没有柄的兄弟姐妹对磷酸盐的获取依赖于分裂细胞的茎的长度。显然，茎的生理作用是促进磷酸盐的获取。Ca2+在这一过程中的刺激作用可归因于其对茎发育的支持以及在细胞-茎接合处稳定细胞膜/细胞包膜的联系。
Ca2+ stimulated stalk development in C. crescentus and relieved the inhibition of development caused by phosphate. This suggested that phosphate inhibition could be attributed to its interaction with Ca2+, thereby depriving the cells of a factor that promoted development. Ca2+ promoted phosphate acquisition by the cells, observed as acceleration of growth at extremes of phosphate concentration, as promotion of C-source utilization rather than storage and as support for phosphate-dependent resistance to arsentate inhibition of growth. Cytological studies of dividing cells revealed that stalked siblings had greater access to exogenous phosphate for use in growth or for storage as polyphosphate and that access of non-stalked siblings to phosphate was dependent on the length of the stalk of the dividing cell. Apparently, the physiologic role of the stalk is enhancement of phosphate acquisition. The stimulatory role of Ca2+ in this process was attributed to its support of stalk development and to its stabilization of internal membrane/cell envelope association within the cell-stalk juncture.