Only the amino acid sequence of a polypeptide chain defines its function. A polypeptide chain having a certain amino acid sequence serves as a subunit of immunoglobulin, while another polypeptide chain having a different amino acid sequence functions as a subunit of an enzyme, such as lactate dehydrogenase. It then follows that a change in the amino acid sequence of a polypeptide chain can deprive that polypeptide chain from the performance of its assigned function.
KeywordsCodon Cysteine Serine Pyruvate Glutamine
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