Table 5.

Hydrogen bond between amino acid residue in the binding pocket of human glutamine synthetase (hGS) and aridanin.

S/N	Amino acid residue with position	Distance H-A (Ǻ)	Distance D-A (Ǻ)	Donor Angle	Protein donor?	Side chain?
1	GLY 132	3.68	4.10	107.64	Yes	No
2	SER 257	2.03	2.98	170.68	Yes	Yes

Distance H-A: Distance between hydrogen and acceptor atoms; Distance D-A: Distance between donor and acceptor atom. Protein donor? Yes indicates protein is the donor group for the interaction. Sidechain? Yes indicates that the hydrogen bond is formed with the amino acid side chain while No indicates otherwise.