Characterization of Solt, a novel SoxLZ/Sox6 binding protein expressed in adult mouse testis |
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Authors: | Yamashita A Ito M Takamatsu N Shiba T |
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Institution: | Department of Biosciences, School of Science, Kitasato University, 1-15-1 Kitasato, Sagamihara, 228, Kanagawa, Japan. |
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Abstract: | SoxLZ/Sox6, a member of the Sox protein family, contains a leucine zipper motif in addition to an HMG box, which is its DNA binding domain. Here we have identified a novel SoxLZ/Sox6 binding protein, termed Solt, which we obtained independently using both a far-Western blot and a yeast two-hybrid screen. Like SoxLZ/Sox6 mRNA, Solt mRNA was exclusively expressed in the testis in mouse. Solt contains an unusual leucine zipper, which bound to the leucine zipper region of SoxLZ/Sox6 in vitro. In transient transfection assays in CHO cells with SoxLZ/Sox6 containing the transactivational region of herpes simplex virus VP16, expression of a reporter gene that carries a cis binding region for Sox proteins was significantly enhanced by the co-expression of Solt and Ca(2+)/calmodulin-dependent protein kinase IV. |
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