Comparison of beta-Galactosidases from Normal and Operator Constitutive Strains of E. Coli Protein Renaturation beta-Galactosidase Peptide Mapping This brief article, Steers, Craven, and Anfinsen reported the results of various physical and chemical studies involving enzymatic comparisons of the lactose splitting enzyme beta-galactosidases from the "normal," or "wild type," and "operator constitutive" strains of E. coli. They determined that no detectable differences could be found between the two protein preparations, and concluded that the operator locus, the region of DNA at one end of an operon that acts as the binding site for repressor proteins, did not specify any part of the structure of the beta-galactosidase molecule. National Academy Press (U.S.), October 1965 National Academy Press, October 1965 Proceedings of the National Academy of Sciences of the United States of America Steers, Edward , Jr Craven, Gary R. Anfinsen, Christian B. Anfinsen, Christian B. Articles Archival Materials Text 8 pages nlm:nlmuid-101584571X169-doc 101584571X169 http://resource.nlm.nih.gov/101584571X169 Profiles ID: KKBBLC English Profiles in Science