Structural features of residue 21 in chain B

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Electrostatic Interactions:
ASP A 26 OD1	HIS B 21 ND1	-2.424	INTER-CHAIN
ASP A 26 OD2	HIS B 21 ND1	-2.762	INTER-CHAIN
ASP A 31 OD1	HIS B 21 ND1	-2.319	INTER-CHAIN
ASP A 31 OD2	HIS B 21 ND1	-2.789	INTER-CHAIN
ARG A 74 NH2	HIS B 21 NE2	2.191	INTER-CHAIN
ARG B 4 NH1	HIS B 21 NE2	2.225	INTRA-CHAIN
HIS B 21 ND1	ARG B 4 NH1	2.409	INTRA-CHAIN
HIS B 21 ND1	ASP A 26 OD1	-2.424	INTER-CHAIN
HIS B 21 ND1	ASP A 31 OD1	-2.319	INTER-CHAIN
HIS B 21 ND1	ARG A 74 NH1	2.333	INTER-CHAIN
HIS B 21 NE2	ARG B 4 NH1	2.225	INTRA-CHAIN
HIS B 21 NE2	ASP A 26 OD1	-2.422	INTER-CHAIN
HIS B 21 NE2	ASP A 31 OD1	-2.645	INTER-CHAIN

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Protrusion Index:
HIS B 21 N	0.69
HIS B 21 CA	0.78
HIS B 21 C	0.72
HIS B 21 O	0.56
HIS B 21 CB	0.54
HIS B 21 CG	0.60
HIS B 21 ND1	0.54
HIS B 21 CD2	0.81
HIS B 21 CE1	0.80
HIS B 21 NE2	0.89

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Salt bridges:
HIS B 21	ASP A 31	3.042	INTER-CHAIN

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Van der Waal's Interactions:
SER B 17 OG 129	HIS B 21 NE2 154	-0.018	INTRA-CHAIN
SER B 19 OG 140	HIS B 21 NE2 154	-0.035	INTRA-CHAIN
GLY B 20 O 144	HIS B 21 NE2 154	-0.141	INTRA-CHAIN
HIS B 21 NE2 154	ASP A 26 OD2 195	-0.010	INTER-CHAIN
HIS B 21 NE2 154	GLY A 30 O 217	-0.207	INTER-CHAIN
HIS B 21 NE2 154	ASP A 31 OD2 225	-0.018	INTER-CHAIN
HIS B 21 NE2 154	PRO A 34 CD 246	-0.025	INTER-CHAIN