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DNA binding activity of recombinant SRY from normal males and XY females
V R Harley1, D I Jackson, P J Hextall
1Human Molecular Genetics Laboratory, Imperial Cancer Research Fund, London, United Kingdom.
Abstract:
The protein encoded by the human testis determining gene, SRY, contains a high mobility group (HMG) box related to that present in the T cell-specific, DNA-binding protein TCF-1. Recombinant SRY protein was able to bind to the same core sequence AACAAAG recognized by TCF-1 in a sequence dependent manner. In five XY females point mutations were found in the region encoding the HMG box. In four cases DNA binding activity of mutant SRY protein was negligible; in the fifth case DNA binding was reduced. These results imply that the DNA binding activity of SRY is required for sex determination.
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