Synthesis of functional signaling domains by combinatorial polymerization of phosphorylation motifs.

ABSTRACT: The adaptor protein Cas contains a core substrate domain with multiple YXXP motifs that are phosphorylated by Src and other tyrosine kinases. Here, we used a synthetic strategy to determine the importance of the arrangement, spacing, and identity of the YXXP motifs. By polymerizing short DNA sequences encoding two phosphorylation motifs, we created a panel of Cas mutants in which the entire substrate domain was replaced by synthetic domains containing random numbers and arrangements of the motifs. Most of these synthetic Cas variants were recognized and phosphorylated by Src in vitro and in intact mammalian cells. The random polymer mutants also restored migration activity to Cas knockout cells; even artificial proteins containing a single motif retained some biological function. Our resul

SUBMITTER: Patwardhan P 

PROVIDER: S-EPMC2841314 | biostudies-literature | 2009 Sep

REPOSITORIES: biostudies-literature