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The Sidechain Bonding Gallery shows the sidechain atoms that can act as hydrogen bond donors or acceptors (or both).

The table below summarizes the bonding information. For the last segment (or C terminal) of a protein, add one to the atom numbers shown.

Histidine is a special case, with two tautomers. In one tautomer, atom 10 is a donor, and atom 7 is an acceptor. In the other tautomer, the roles are reversed. Both atom 7 and 10 are nitrogen. The difference is which nitrogen has a hydrogen attached. See Are all Histidines in Foldit the same? for more detail.

amino acid donor atom(s) donor count acceptor atoms(s) acceptor count
serine 6 1 6 2
threonine 6 1 6 2
glutamate 8, 9 4
aspartate 7, 8 4
glutamine 9 2 8 2
asparagine 8 2 7 2
histidine (tautomer 1) 10 1 7 1
histidine (tautomer 2) 7 1 10 1
lysine 9 3
arginine 8, 10, 11 5
tryptophan 9 1
tyrosine 9 1 9 1

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