Abstract:
:Rab proteins play fundamental roles in the regulation of membrane traffic. Previously, from the brain of Bombyx mori we isolated two cDNA clones (BRab1 and BRab14), each of which encoded a different member of Rab-protein family and was expressed in Escherichia coli and purified using an affinity chromatography. In this study, one cDNA clone (BRab8) was isolated from a cDNA library from the brain of B. mori. The recombinant protein was expressed in E. coli and purified. Next, the phosphorylations of these three purified BRab proteins were examined, using mammalian protein kinases in vitro. Protein kinase C (PKC) phosphorylated BRab8 and BRab14 proteins. Protein kinase A faintly phosphorylated BRab8 and BRab14 proteins. Calcium/calmodulin-dependent protein kinase faintly phosphorylated BRab8 protein. Next, brains of B. mori were dissected and homogenized. The homogenate showed a calcium-dependent protein kinase activity of BRab8 and BRab14 proteins. So PKC from the brain of B. mori was partially purified by a sequence of chromatographies on DEAE-Cellulofine and affinity chromatography. This PKC phosphorylated BRab8 and BRab14 proteins. These results suggest that the function of Rab proteins in the brain of B. mori is regulated by calcium-dependent protein kinases.
journal_name
Arch Insect Biochem Physioljournal_title
Archives of insect biochemistry and physiologyauthors
Uno T,Nakao A,Katsurauma Cdoi
10.1002/arch.20014subject
Has Abstractpub_date
2004-10-01 00:00:00pages
68-77issue
2eissn
0739-4462issn
1520-6327journal_volume
57pub_type
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