By P.M. Jordan (Eds.)
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Additional info for Biosynthesis of Tetrapyrroles
M. so this was eliminated as a candidate immediately. A hydroxymethylbilane was proposed as one of the most likely structures for the intermediate  since substitution of -OH for -NH, characteristically produces a shift of about 20 ppm, similar to that observed. In the absence of an authentic standard other possibilities were also considered [2211. The most important question, however, still needed to be answered, namely, what was the significance of the transient species and had we discovered the elusive substrate for the uroporphyrinogen I11 synthase enzyme?
Alternatively a regulatory mechanism may be involved in which the binding of lead to four of the subunits in the octamer may induce a conformational change in the other four subunits which results in the total loss of activity. The EXAFS data discussed above  may be consistent with these observations. 6. Nature of the uctive site groups The first detailed studies on the mechanism of action of 5-aminolaevulinic acid dehydratase were those carried out by Shemin and his colleagues with the enzyme from R.
Aspects of the C-5 pathway have been expertly reviewed elsewhere [128,129] and a detailed account is presented in Chapter 5 of this volume. The involvement of tRNA,,, has also been reviewed in a scholarly account . 5. 1. 24), also called porphobilinogen synthase, was soon described in ox liver [ 121 and avian erythrocytes [l 11. The enzyme has since been shown to exist in virtually all living systems and has been purified to homogeneity from a variety of sources including human erythrocytes [ 130,1311, bovine liver [ 132,1331 and R.