The invention provides proteins attached to solid supports, and methods of preparing such solid support-bound proteins are provided. The proteins are attached to solid supports by means of an unnatural amino acid incorporated into the protein, which unnatural amino acid includes a reactive group that can react with a second reactive group that is attached to a solid support.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH
 This invention was made with government support under Grant DE-FG03-00ER45812, awarded by the United States Department of Energy, and by Grant GM62159, awarded by the National Institutes of Health. The Government may have certain rights in the invention.