Structural features of residue 21 in chain A

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Electrostatic Interactions:
ASP A 18 OD1	HIS A 21 ND1	-3.035	INTRA-CHAIN
ASP A 18 OD2	HIS A 21 ND1	-3.716	INTRA-CHAIN
HIS A 21 ND1	ASP A 18 OD1	-3.035	INTRA-CHAIN
HIS A 21 NE2	ASP A 18 OD1	-3.690	INTRA-CHAIN
ASP A 66 OD2	HIS A 21 ND1	-1.477	INTRA-CHAIN

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Protrusion Index:
HIS A 21 N	0.97
HIS A 21 CA	1.06
HIS A 21 C	0.86
HIS A 21 O	0.84
HIS A 21 CB	1.04
HIS A 21 CG	1.57
HIS A 21 ND1	1.78
HIS A 21 CD2	1.89
HIS A 21 CE1	2.31
HIS A 21 NE2	2.59

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Salt bridges:
ASP A 18	HIS A 21	3.080	INTRA-CHAIN

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Van der Waal's Interactions:
ASP A 18 OD2 114	HIS A 21 NE2 136	-0.259	INTRA-CHAIN