In CSA, which end of tyramine binds biotin or other molecules?

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Multiple Choice

In CSA, which end of tyramine binds biotin or other molecules?

Explanation:
Biotin or similar labeling reagents typically attach to primary amines through amide bond formation. Tyramine has a primary amine at the end of its side chain, which makes that end the reactive site for conjugation (for example with biotin-NHS esters). The phenolic group on the ring is not the usual coupling point for this type of labeling, and tyramine does not have a carboxyl or sulfhydryl end to react with NHS esters in the same way. Therefore, the amine end is the site that binds biotin or other molecules.

Biotin or similar labeling reagents typically attach to primary amines through amide bond formation. Tyramine has a primary amine at the end of its side chain, which makes that end the reactive site for conjugation (for example with biotin-NHS esters). The phenolic group on the ring is not the usual coupling point for this type of labeling, and tyramine does not have a carboxyl or sulfhydryl end to react with NHS esters in the same way. Therefore, the amine end is the site that binds biotin or other molecules.

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