Profiles of Physarum Microplasmodial Phosphatase Activity Crucial to Cytoplasmic Streaming and Spherule Formation

Profiles of Physarum Microplasmodial Phosphatase Activity Crucial to Cytoplasmic Streaming and Spherule Formation
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绒泡菌微胞体磷酸酶活性对细胞质流和小球形成至关重要

DOI:
10.1007/s12013-019-00885-2
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发表时间:
2019
影响因子:
2.6
通讯作者:
Takako S Kaneko
Takako S Kaneko
中科院分区:
生物学4区
文献类型:
--
作者:
Chisa Y Okada;Akio Nakamura;Kyoko Ogawa;Kazuhiro Kohama;Takako S Kaneko

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本研究首次研究了暗饥饿(DS)条件下,植物体微质体磷酸酶(PPH)对植物体肌球蛋白II(PLCM)轻链磷酸化的影响、胞质流动速度以及PPH在球体形成过程中的表达。在本研究中,我们根据纯化的PPH酶的N端氨基酸序列,采用聚合酶链式反应的方法克隆了PPH的全长cDNA。该基因包含一个1245 的开放阅读框,对应于415个氨基酸。我们证实,PPH对PLCM活性的快速增加和细胞质流动速度的迅速降低先于植酸微质体球的形成。在DS过程中,PPH对PLCM活性的增加、PPH的表达和PPH的积累与植物体微质体内球体的形成有关。此外,应用小麦胚细胞无细胞表达系统,成功地生产了重组PPH,并表达了针对PLCM的磷酸酶活性。这些结果表明,PPH参与了微绒毛霉在DS过程中胞质流动的停止。
This study aimed to investigate for the first time, the profile ofPhysarummicroplasmodial phosphatase (PPH) activity toward the phosphorylated light chain ofPhysarummyosin II (PLCM) at pH 7.6, the velocity of cytoplasmic streaming, and PPH expression in spherule formation during dark starvation (DS). In this study, we cloned the full-length cDNA of PPH using polymerase chain reaction, based on the N-terminal amino acid sequence of the purified enzyme. The cDNA contained an open reading frame (ORF) of 1245 bp, corresponding to 415 amino acids. We confirmed that a rapid increase in PPH activity toward PLCM and a rapid decrease in cytoplasmic streaming velocity precede spherule formation byPhysarummicroplasmodia. The profiles of increase in PPH activity toward PLCM,PPHexpression, and PPH accumulation during DS were correlated with spherule formation in thePhysarummicroplasmodia. Moreover, application of the wheat germ cell-free expression system resulted in the successful production of recombinant PPH and in the expression of phosphatase activity toward PLCM. These results suggest that PPH is involved in the cessation of cytoplasmic streaming inPhysarummicroplasmodia during DS.
DOI: 10.1093/oxfordjournals.aob.a083834
发表时间: 1963
期刊: Annals of Botany
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DOI: --
发表时间: 1982
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DOI: 10.1007/bf00412355
发表时间: 2004
期刊: Archiv für Mikrobiologie
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