. The chemical activities of bacteria. Bacteria. 34 BACTERIAL ENZYMES In the latter case it probably reacts with the —NHg group of an amino-acid and is converted to pyridoxamine phosphate, leaving the keto-acid corresponding to the amino-acid. Pyridoxamine phosphate can then react with a suitable keto-acid converting it to the corresponding amino-acid while being itself restored to the pyridoxal form. Haematin CH=CH2 CH=CH. This forms the prosthetic group of haemoglobin and of enzymes such as catalase, peroxidase, and cytochrome oxidase. Side chains may differ in dif
. The chemical activities of bacteria. Bacteria. 34 BACTERIAL ENZYMES In the latter case it probably reacts with the —NHg group of an amino-acid and is converted to pyridoxamine phosphate, leaving the keto-acid corresponding to the amino-acid. Pyridoxamine phosphate can then react with a suitable keto-acid converting it to the corresponding amino-acid while being itself restored to the pyridoxal form. Haematin CH=CH2 CH=CH. This forms the prosthetic group of haemoglobin and of enzymes such as catalase, peroxidase, and cytochrome oxidase. Side chains may differ in different enzymes, etc. Metals Some enzymes contain a metal in their structure, while others are activated by the presence of metal coenzymes. Thus phosphatase is activated by magnesium ions, while in other cases metals such as copper (polyphenol oxidase) or zinc (carbonic anhydrase) appear to be an essential part of the enzyme structure. PROSTHETIC GROUPS OF INCOMPLETELY DETERMINED STRUCTURE Coenzyme A Lipmann, in the course of studies on the acetylation of sulphanilamide by pigeon liver, discovered that the acetylase involved possessed a prosthetic group which could not be. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gale, E. F. (Ernest Frederick). New York, Academic Press
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