EFFECT OF CALCIUM-ION ON HYDRILLA-VERTICILLATA THYLAKOID MEMBRANE O-2 EVOLUTION

被引：0

作者：

MISHRA, SR ^{[1
]}

SABAT, SC ^{[1
]}

机构：

[1] INST LIFE SCI,ENVIRONM BIOL UNIT,BHUBANESWAR 751007,ORISSA,INDIA

来源：

INDIAN JOURNAL OF BIOCHEMISTRY & BIOPHYSICS | 1995年 / 32卷 / 02期

关键词：

D O I：

暂无

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Calcium ion-dependent reactivation of O-2 evolution activity has been investigated in Hydrilla verticillata thylakoid preparations. Washing the thylakoids in calcium-free buffer or calcium-free buffer containing 1.5 M NaCl or 1.5 M NaCl plus 20% methanol, reversibly inhibited O-2 evolution activity. The activity was restored on addition of calcium as calcium chloride and partially by strontium chloride. Immobilization of thylakoids with glutaraldehyde (GA) arrested the loss in O-2 evolution activity caused by calcium-free high salt washing. However, calcium sensitivity was discernible in GA immobilized thylakoids subjected to calcium-free high salt washing. Since glutaraldehyde checks the loss of extrinsic thylakoid polypeptides due. to washing, it is assumed that the calcium ion has regulatory functions in the photosynthetic electron transport, besides its interaction with thylakoid proteins.

引用

页码：94 / 99

页数：6

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