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- In fact, enzymes generally only recognize a few amino acids.
- For example, the enzyme trypsin is constructed
- such that it only recognizes the amino acids
- arginine and lysine.
- The intersections of line segments
- represent carbon atoms. The group of two
- oxygen atoms and a carbon atom at the right
- side of the structure to the left is known as a
- carboxyl group. All amino acids have carboxyl
- groups. However, trypsin is shaped such that
- only arginine and lysine fit onto the active site
- of the enzyme like a key into a lock. When
- trypsin recognizes arginine or lysine, it splits
- the amino acid from others it may be joined
- to along the carboxyl group by hydrolyzing
- the peptide bond. An enzyme will not react
- with an amino acid that does not fit into
- its active site.
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