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extracellular calmodulin: A polypeptide signal in plants?

Science China(Life Sciences) 2001年第5期44卷 449-460页

作者：孙大业唐文强马力耕 Institute of Molecular and Cell Biology College of Life Science Hebei Normal University Shijiazhuang China

Traditionally, calmodulin (CaM) was thought to be a multi-functional receptor for intracellular Ca2+ signals. But in the last ten years, it was found that CaM also exists and acts extracellularly in animal and plant cells to regulate many important physiological functions. Laboratory studies by the authors showed that extracellular CaM in plant cells can stimulate the proliferation of suspension cultured cell and protoplast; regulate pollen germination and pollen tube elongation,and stimulate the light-independent gene expression of Rubisco small subunit (rbcS). Furthermore,we defined the trans-membrane and intracellular signal transduction pathways for extracellular CaM by using a pollen system. The components in this pathway include heterotrimeric G-protein,phospholipase C, IP3, calcium signal and protein phosphorylation etc. Based on our findings, we suggest that extracellular CaM is a polypeptide signal in plants. This idea strongly argues against the traditional concept that there is no intercellular polypeptide signal in plants.

关键词： signal transduction extracellular calmodulin polypeptide signal.

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H~+-ATPase in the plasma membrane of Arabidopsis pollen cells is involved in extracellular calmodulin-promoted pollen germination

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Progress in Natural Science:Materials International 2009年第9期19卷 1071-1078页

作者： Wending Sun1, Sujuan Li1, Junying Xu, Ting Liu, Zhonglin Shang* Hebei Key Laboratory of Molecular and Cellular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang 050016, China Hebei Key Laboratory of Molecular and Cellular Biology College of Life Sciences Hebei Normal University Shijiazhuang 050016 China

In this paper, the role of the plasma membrane (PM) H+-ATPase in extracellular calmodulin (CaM)-promoted pollen germination and in tube growth of Arabidopsis thaliana was investigated. Pollen germination, pollen tube growth rate, free cytosolic Ca2+ concentration ([Ca2+]cyt) and Ca2+ channel activity in the PM of pollen cells were measured. In response to fusicoccin or CaM treatment, in vitro pollen germination and pollen tube growth rate, [Ca2+]cyt and activity of a hyperpolarization-activated Ca2+-permeable channel increased. Sodium vanadate inhibited the promotion of these parameters by extracellular CaM. The results suggest that H+-ATPase may be involved in extracellular CaM-regulated pollen germination and in tube growth by modulation of the hyperpolarization-activated Ca2+ channel in the PM of A. thaliana pollen cells.

关键词： Arabidopsis thaliana H+-ATPase Pollen extracellular calmodulin Hyperpolarization-activated calcium channel

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A Signaling Pathway Linking Nitric Oxide Production to eterotrimeric G Protein and H2O2 Regulates extracellular calmodulin Induction of Stomatal Closure in Arabidopsis

A Signaling Pathway Linking Nitric Oxide Production to etero...

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2007中国植物生理学会全国学术会议

作者： Jian-Hua Li~1 Yin-Qian Liu~1 Pin Lu~2 Hai-Fei Lin~1 Yang Bai~1 Xue-Chen Wang~3 Yu-Ling Chen~(1*) (1 College of Life Science,Hebei Normal University,Shijiazhuang 050016,China) (2 School of Basic Medical Sciences,Hebei Medical University,Shijiazhuang 050017,China) (3 National Laboratory of Plant Physiology and Biochemistry,College of Biological Sciences,China Agricultural University,Beijing 100094,China)

extracellular calmodulin(ExtCaM)regulates stomatal movement by eliciting a cascade of intracellular signaling events including heterotrimeric G protein,HO and ***,the ExtCaM-mediated guard cell signaling pathway remains poorly *** this report,we show that Arabidopsis(Arabidopsis thaliana)nitric oxide synthase 1(AtNOS1)-mediated nitric oxide(NO)generation plays a crucial role in

关键词： extracellular calmodulin stomatal movements G protein H`2O`2 nitric oxide

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H+-ATPase in Plasma Membrane of Arabidopsis Pollen Cells is Involved in extracellular CaM-promoted Pollen Germination

H+-ATPase in Plasma Membrane of Arabidopsis Pollen Cells is ...

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中国植物生理学会第十次会员代表大会暨全国学术年会

作者： Wending Sun, Sujuan Li, Junying Xu, Ting Liu, Zhonglin Shang* College of Life Sciences, Hebei Normal University, Shijiazhuang 050016, PR China

＜正＞In this paper, the role of plasma membrane （PM） H+-ATPase in extracellular calmodulin （CaM） promoted pollen germination and tube growth of Arabidopsis thaliana was investigated. Pollen germination, pollen

关键词： Arabidopsis thaliana H+-ATPase pollen extracellular calmodulin hyperpolarization-activated calcium channel.

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