Bacterial Proteins Chloroplasts Dithiothreitol Electrophoresis, Polyacrylamide Gel Enzyme Activation Fructose-Bisphosphatase Iodoacetamide Iodoacetates Light Methylation Oxidation-Reduction Peptide Fragments Protein Conformation Protein Denaturation Solvents Sulfhydryl Compounds Support, Non-U.S. Gov't Thioredoxin article bacterial protein chloroplast dithiothreitol drug effect enzyme activation enzymology fructose bisphosphatase iodoacetamide iodoacetic acid light metabolism