Peptides and other small molecules derived from regions of interacting proteins and uses thereof

Abstract

The present invention relates generally to the field of peptides and other small molecules (i.e. peptide mimetics) as pharmaceutical and/or therapeutic agents, and to methods for identification and design of peptides and peptide mimetics having desired functional activities. Specifically, peptides and other small molecules derived from regions of interacting intracellular signaling proteins are provided. More specifically, peptides and other small molecules derived from regions of the G&bgr; subunit of heterotrimeric GTP binding proteins are provided. Such molecules include specific agonists and antagonists of G&bgr; downstream effectors, including adenylyl cyclase and phospholipase C. Such molecules are targeted to predicted regions of interaction between intracellular signaling proteins and tested for activity in functional assays using methods of the invention. One major advantage of the invention is the incorporation of three-dimensional structural information in models used for predicting interaction surfaces between intracellular proteins. Another major advantage is the ability to distinguish, within a predicted interaction surface, a signal transfer region from a general binding domain. Resolution of such signal transfer regions from general binding domains is useful for prediction and validation of pharmacologic and therapeutic agonists and antagonists.