Many RNA polymerase II promoters lack the characteristic TATA box sequence located -25/-30 nucleotides upstream from the transcription start. In Drosophila, half of the promoters identified so far are TATA-deficient. The yemanuclein-alpha gene whose promoter activity is restricted to oogenesis, falls in this class. A number of upstream and downstream promoter elements have been identified for some TATA-less promoters. The yem-alpha promoter contains none of the consensus elements identified so far. Our work was based on the assumption that the physical parameters of the DNA could be used to predict the location of the yem-alpha promoter. A sequence based computational analysis allowed us to determine the characteristic changes of DNA curvature and helix stability in the presumptive regulatory region. Our experimental data were in good agreement with the computational analysis. We have started to investigate the general value of this approach by analyzing other promoters.