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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Expression of developmentally regulated plasma membrane polypeptide (DREPP2) in rice root tip and interaction with Ca2+/CaM complex and microtubule
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Expression of developmentally regulated plasma membrane polypeptide (DREPP2) in rice root tip and interaction with Ca2+/CaM complex and microtubule

机译:发育调节质膜多肽(DREPP2)在水稻根尖中的表达及其与Ca2 + / CaM复合物和微管的相互作用

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摘要

The cytoplasmic free Ca2+ could play an important role for salt tolerance in rice root (Oryza sativa L.). Here, we compared the expression profiles of two putative developmentally regulated plasma membrane polypeptides (DREPP1 and DREPP2) in rice roots of salt-tolerant cv. Pokkali and salt-sensitive cv. IR29. The messenger RNA (mRNA) for OsDREPP1 could be detected in all parts of root and did not change upon salt stress, whereas the mRNA for OsDREPP2 was detected only in root tips. The transcript level of OsDREPP2 first disappeared upon salt stress, then recovered in Pokkali, but not recovered in IR29. The gene-encoding OsDREPP2 was cloned from cv. Pokkali and expressed in Escherichia coli, and its biochemical properties were studied. It was found that OsDREPP2 is a Ca2+-binding protein and binds also to calmodulin (CaM) as well as microtubules. The mutation of Trp4 and Phe16 in OsDREPP2 to Ala decreased the binding of DREPP2 to Ca2+/CaM complex, indicating the N-terminal basic domain is involved for the binding. The binding of OsDREPP2 to microtubules was inhibited by Ca2+/CaM complex, while the binding of double-mutant OsDREPP2 protein to microtubules was not inhibited by Ca2+/CaM complex. We propose that CaM inhibits the binding of DREPP2 to cortical microtubules, causes the inhibition of microtubule depolymerization, and enhances the cell elongation.
机译:胞质中游离的Ca2 +可能对水稻根系(Oryza sativa L.)的耐盐性起重要作用。在这里,我们比较了两个假定的受发育调节的质膜多肽(DREPP1和DREPP2)在耐盐简历的水稻根中的表达谱。 Pokkali和对盐敏感的简历。 IR29。 OsDREPP1的信使RNA(mRNA)可以在根的所有部分检测到,并且在盐胁迫下不会改变,而OsDREPP2的mRNA仅在根尖检测到。 OsDREPP2的转录水平首先在盐胁迫下消失,然后在Pokkali中恢复,但在IR29中未恢复。从cv克隆了编码基因的OsDREPP2。研究了Pokkali并在大肠杆菌中表达,并对其生化特性进行了研究。发现OsDREPP2是一种Ca2 +结合蛋白,还与钙调蛋白(CaM)以及微管结合。 OsDREPP2中Trp4和Phe16突变为Ala降低了DREPP2与Ca2 + / CaM复合物的结合,表明N端基本域参与了结合。 Cas + / CaM复合物抑制OsDREPP2与微管的结合,而Ca2 + / CaM复合物不抑制OsDREPP2双突变OsDREPP2蛋白与微管的结合。我们提出,CaM抑制DREPP2与皮质微管的结合,引起微管解聚的抑制,并增强细胞伸长。

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