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Keywords = phostensin-β

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12 pages, 2314 KB  
Communication
Identification of the High Molecular Weight Isoform of Phostensin
by Yu-Shan Lin, Hsien-Lu Huang, Wei-Ting Liu, Ta-Hsien Lin and Hsien-Bin Huang
Int. J. Mol. Sci. 2014, 15(1), 1068-1079; https://doi.org/10.3390/ijms15011068 - 15 Jan 2014
Cited by 6 | Viewed by 6272
Abstract
Phostensin is encoded by KIAA1949. 5'-RACEanalysis has been used to identify the translation start site of phostensin mRNA, indicating that it encodes 165 amino acids with an apparent molecular weight of 26 kDa on SDS-PAGE. This low-molecular-weight phostensin is present in human [...] Read more.
Phostensin is encoded by KIAA1949. 5'-RACEanalysis has been used to identify the translation start site of phostensin mRNA, indicating that it encodes 165 amino acids with an apparent molecular weight of 26 kDa on SDS-PAGE. This low-molecular-weight phostensin is present in human peripheral blood mononuclear cells and many leukemic cell lines. Phostensin is a protein phosphatase-1(PP1) binding protein. It also contains one actin-binding motif at its C-terminal region and binds to the pointed ends of actin filaments, modulating actin dynamics. In the current study, a high-molecular-weight phostensin is identified by using immunoprecipitationin combination with a proteomic approach. This new species of phostensin is also encoded by KIAA1949 and consists of 613 amino acids with an apparent molecular weight of 110 kDa on SDS-PAGE. The low-molecular-weight and high-molecular-weight phostensins were named as phostensin-α and phostensin-β, respectively. Although phostensin-α is the C-terminal region of phostensin-β, it is not degraded from phostensin-β. Phostensin-β is capable of associating with PP1 and actin filaments, and is present in many cell lines. Full article
(This article belongs to the Section Biochemistry)
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