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Amino group

Amino group in the backbone of the first amino acid in a protein, known as the N terminal.

The amino group is what gives Amino Acids their name. The amino group is the first component of the backbone of every amino acid.

Amino group lysine

Amino group in the sidechain of lysine.

An amino group in its standard form consists of a nitrogen and two hydrogens attached to something. Foldit shows amino groups in their charged or "protonated" form, with three hydrogens. This form is what normally occurs in the aqueous solution inside a cell.

The amino acid lysine also has an amino group at the end of its sidechain.

As a protein is built, amino acids are chained together by peptide bonds. This has the effect of removing two hydrogen atoms from the amino group of every amino acid added to the chain. The first amino acid in the chain, known as the N terminal, keeps all three hydrogens. See protein backbone for more detail.

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