Abstract
MAP/Microtubule affinity-regulating kinase 4 (MARK4), a Ser/Thr protein kinases, is related to the Par-1 (partitioning-defective) gene products, and is the human ortholog of Par-1. MARK4 shows its role in the cell polarity at the time of embryonic development. It is mostly located at the basal region of cells, providing apico-basal polarity. Here, we made two variants of human Par-1d (MARK4), kinase domain (MARK4-F2), and kinase domain along with 59 N-terminal residues (MARK4-F1) and saw their ATPase hydrolysis in the presence of each other. We observed that the activity of one variant was increased in the presence of other. We also demonstrated that both variants were phosphorylated by atypical PKC and their activities were increased in the presence of increasing concentration of atypical protein kinase c (aPKC). The phosphorylation was observed at the serine and threonine residues of MARK4. The interaction of MARK2 and MARK3 with aPKC and their negative regulation by aPKC is already known. This study confirms a functional link between aPKC and MARK4, two central determinants of cell polarity, and it suggests that aPKC may regulate all four members of Par-1 through phosphorylating them in polarized cells.
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Acknowledgments
FN acknowledges the Council of Scientific and Industrial Research for the award of fellowship. We sincerely thank Dana-Farber/Harvard Cancer Center (DF/HCC) Boston, MA 02215 for providing the clone of MARK4. FA and MIH are thankful to the Department of Science and Technology (Government of India) and Indian Council for Medical Research (ICMR) for financial support. Authors thank Department of Science and Technology, Government of India for the FIST support (SR/FST/LSI-541./2012).
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Naz, F., Islam, A., Ahmad, F. et al. Atypical PKC phosphorylates microtubule affinity-regulating kinase 4 in vitro. Mol Cell Biochem 410, 223–228 (2015). https://doi.org/10.1007/s11010-015-2555-3
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DOI: https://doi.org/10.1007/s11010-015-2555-3