Structural features of residue 21 in chain A

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Electrostatic Interactions:
ASP A 18 OD1	HIS A 21 ND1	-3.727	INTRA-CHAIN
ASP A 18 OD2	HIS A 21 ND1	-5.235	INTRA-CHAIN
HIS A 21 ND1	ASP A 18 OD1	-3.727	INTRA-CHAIN
HIS A 21 ND1	ASP B 199 OD1	-1.384	INTER-CHAIN
HIS A 21 NE2	ASP A 18 OD1	-3.730	INTRA-CHAIN
HIS A 21 NE2	ASP B 199 OD1	-1.581	INTER-CHAIN
HIS A 21 NE2	ARG B 201 NH1	2.155	INTER-CHAIN
ASP B 199 OD1	HIS A 21 ND1	-1.384	INTER-CHAIN
ASP B 199 OD2	HIS A 21 ND1	-1.515	INTER-CHAIN
ARG B 201 NH1	HIS A 21 NE2	2.155	INTER-CHAIN

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Protrusion Index:
HIS A 21 N	0.95
HIS A 21 CA	1.08
HIS A 21 C	0.81
HIS A 21 O	0.86
HIS A 21 CB	1.04
HIS A 21 CG	1.37
HIS A 21 ND1	2.11
HIS A 21 CD2	1.57
HIS A 21 CE1	2.53
HIS A 21 NE2	2.16

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Salt bridges:
ASP A 18	HIS A 21	2.888	INTRA-CHAIN

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Van der Waal's Interactions:
ASP A 18 OD2 89	HIS A 21 NE2 111	-0.598	INTRA-CHAIN
ALA A 20 CB 101	HIS A 21 NE2 111	-0.048	INTRA-CHAIN