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A cDNA clone encoding methyl DNA binding domain-containing protein (bMBD2/3) was obtained by homology searches using a Bombyx mori fat body cDNA library. The cDNA encoded a polypeptide with 249 amino acids sharing 54% similarity with the methyl DNA binding protein from Drosophila melanogaster. To characterize the biochemical properties of bMBD2/3, the clone was expressed in Escherichia coli as His-tagged protein. The recombinant protein was purified to homogeneity using Ni-NTA superflow resin and heparin agarose. The protein showed specific methyl DNA binding activity and was phosphorylated by protein kinase in vitro. Immunoblotting using the purified antibody indicated that bMBD2/3 was expressed in almost all tissues. Using west-western blotting analysis, some proteins that interact with bMBD2/3 were identified in the brain. This is the first report that insect MBD is phosphorylated and is present in adult tissues. These results suggest that bMBD2/3 plays important roles in the DNA methylation-specific transcription of Bombyx mori.
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