Experimental evidence indicates that glyceraldehyde-3-phosphate dehydrogenase contains a critical ______ residue in its active site,as shown by its inactivation by iodoacetamide.

Question

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Iodoacetamide is a chemical compound that specifically reacts with the sulfhydryl group of cysteine residues, causing their inactivation. Therefore, the fact that glyceraldehyde-3-phosphate dehydrogenase is inactivated by iodoacetamide strongly suggests the presence of a critical cysteine residue in its active site.

Experimental Evidence Indicates That Glyceraldehyde-3-Phosphate Dehydrogenase Contains a Critical ______