Reduced nicotinamide adenine dinucleotide phosphate-sulfite reductase of enterobacteria. II. Identification of a new class of heme prosthetic group: an iron-tetrahydroporphyrin (isobacteriochlorin type) with eight carboxylic acid groups.

Carbon Isotopes Carboxylic Acids Chromatography, Thin Layer Copper Escherichia coli/enzymology Heme/analysis Iron/isolation & purification Mass Spectrometry Metals NADP Oxidation-Reduction Oxidoreductases/isolation & purification Porphyrins/chemical synthesis Radioisotopes Spectrometry, Fluorescence Spectrophotometry Spectrophotometry, Infrared Sulfites

Carbon Isotopes Carboxylic Acids Metals Porphyrins Radioisotopes Sulfites Heme NADP Copper Iron Oxidoreductases