Computational Design and Experimental Discovery of an Antiestrogenic Peptide Derived from α-Fetoprotein

Karl N. Kirschner, Katrina W. Lexa, Amanda M. Salisburg, Katherine A. Alser, Leroy Joseph, Thomas T. Andersen, James A. Bennett, Herbert I. Jacobson, George C. Shields
2007 Journal of the American Chemical Society  
Breast cancer is the most common cancer among women, and tamoxifen is the preferred drug for estrogen receptor-positive breast cancer treatment. Many of these cancers are intrinsically resistant to tamoxifen or acquire resistance during treatment. Consequently, there is an ongoing need for breast cancer drugs that have different molecular targets. Previous work has shown that 8-mer and cyclic 9-mer peptides inhibit breast cancer in mouse and rat models, interacting with an unsolved receptor,
more » ... le peptides smaller than eight amino acids did not. We show that the use of replica exchange molecular dynamics predicts the structure and dynamics of active peptides, leading to the discovery of smaller peptides with full biological activity. Simulations identified smaller peptide analogues with the same conserved reverse turn demonstrated in the larger peptides. These analogues were synthesized and shown to inhibit estrogen-dependent cell growth in a mouse uterine growth assay, a test showing reliable correlation with human breast cancer inhibition.
doi:10.1021/ja070202w pmid:17441722 pmcid:PMC4272344 fatcat:pd2m77ox7vctphu3xywei5zs3m