Although amino acids are often shown in textbooks as the right-hand structure, they actually mostly exist as ... and selenocysteine, a cysteine analogue only found in some lineages, are included in ...

The amino acid cysteine has a chemically reactive side chain that can form bonds with another cysteine. Amino acids can also be basic, like lysine, or acidic, like glutamic acid. The sequence and ...

A cocrystal structure ... for this '21 st amino acid'. The structure resolves some mechanistic questions and allows for comparison of the tRNA-dependent synthesis of cysteine and selenocysteine.

They play a crucial role in the structure, function ... The eleven non-essential amino acids are alanine, arginine, asparagine, aspartic acid, cysteine, glutamic acid, glutamine, glycine, proline, ...