Fusion protein linker connection, for example, why can lysine connect with lysine in a double lysine linker (KK)?
The ability of lysine (Lys, K) to connect and form a double lysine linker (such as KK) is mainly due to the following reasons.
1. Chemical Reaction Between Amino and Carboxyl Groups
The side chain of lysine contains an amino group (–NH₂), while its main chain's α-carbon is connected to a carboxyl group (–COOH). When synthesizing a double lysine linker, the carboxyl group of one lysine can connect with the amino group of another lysine through a peptide bond. This reaction is the basis for peptide bond formation. Multiple lysine units can be connected in this way to form polypeptides or linker structures.
2. Flexibility and Connectivity
Lysine's side chain is relatively long and positively charged, providing a flexible connection point in proteins, which allows it to provide appropriate space and angles between different protein domains.
3. Ease of Chemical Modification
The amino group on lysine's side chain can also be easily chemically modified, which is useful in certain specific applications. For example, the amino group can be biotinylated or modified with other functional groups, thereby imparting new functional characteristics to fusion proteins.
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