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protein tyrosine phosphatases Mediate the Signaling Pathway of Stomatal Closure of Vicia faba L.

Journal of Integrative Plant Biology 2005年第3期47卷 319-326页

作者： Wu-LiangSHI XinLIU Wen-SuoJIA Shu-QiuZHANG StateKeyLaboratoryofPlantPhysiologyandBiochemistry CollegeofBiologicalSciencesChinaAgriculturalUniversityBeijing100094China DeportmentofLifeSciences LaiyangAgriculturalCollegeLaiyang265200China CollegeofAgronomyandBiotechnology ChinaAgriculturalUniversityBeijing100094China

The regulation of stomatal movement is one of the most important signaling networks in plants. The H+-ATPase at the plasma membrane of guard cells plays a critical role in the stomata opening, while there are some conflicting results regarding the effectiveness of the plasma membrane H+-ATPase inhibitor, vanadate, in inhibiting stomata opening. We observed that 2 mmol/L vanadate hardly inhibited light-stimulated stomata opening in epidermal peels of Vicia faba L., but significantly inhibited dark- and ABA-induced stomatal closure. These results cannot be explained with the previous findings that H+-ATPase was inhibited by vanadate. In view of the fact that vanadate is an inhibitor of protein tyrosine phosphatases (PTPases), we investigated whether the stomatal movement regulated by vanadate is through the regulation of PTPase. As expected, phenylarsine oxide (PAO), a specific inhibitor of PTPase, has very similar effects and even more effective than vanadate. Typical PTPase activity was found in guard cells of V. faba; moreover, the phosphatase activity could be inhibited by both vanadate and PAO. These results not only provide a novel explanation for conflicting results about vanadate modulating stomatal movement, but also provide further evidence for the involvement of PTPases in modulating signal transduction of stomatal movement.

关键词： abscisic acid (ABA) H+-ATPase protein tyrosine phosphatases stomatal movement Vicia faba L

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Identification of a potent inhibitor of human dual-specific phosphatase,VHR,from computer-aided and NMR-based screening to cellular effects

Identification of a potent inhibitor of human dual-specific ...

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第九届全国酶学学术讨论会暨邹承鲁诞辰85周年纪念会

作者： Sartaj Tabassum Suvigya Mathur Department of Chemistry Aligarh Muslim University

Human vaccinia HI-related phosphatase (VHR) is a dual-specific phosphatase (DSPs) that plays an important role in the mitogen activated protein (MAP) kinase cascade *** is also a potential drug target for diseases tha... 详细信息

关键词： VHR inhibitors NMR protein tyrosine phosphatases virtual screening

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