Structural features of residue 21 in chain A

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Electrostatic Interactions:
ASP A 18 OD1	HIS A 21 ND1	-3.512	INTRA-CHAIN
ASP A 18 OD2	HIS A 21 ND1	-4.601	INTRA-CHAIN
HIS A 21 ND1	ASP A 18 OD1	-3.512	INTRA-CHAIN
HIS A 21 ND1	ASP B 199 OD1	-1.360	INTER-CHAIN
HIS A 21 NE2	ASP A 18 OD1	-3.523	INTRA-CHAIN
HIS A 21 NE2	ASP B 199 OD1	-1.534	INTER-CHAIN
HIS A 21 NE2	ARG B 201 NH1	2.147	INTER-CHAIN
ASP A 66 OD2	HIS A 21 ND1	-1.376	INTRA-CHAIN
ASP B 199 OD1	HIS A 21 ND1	-1.360	INTER-CHAIN
ASP B 199 OD2	HIS A 21 ND1	-1.480	INTER-CHAIN
ARG B 201 NH1	HIS A 21 NE2	2.147	INTER-CHAIN

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Protrusion Index:
HIS A 21 N	0.97
HIS A 21 CA	1.04
HIS A 21 C	0.81
HIS A 21 O	0.80
HIS A 21 CB	0.97
HIS A 21 CG	1.42
HIS A 21 ND1	1.89
HIS A 21 CD2	1.45
HIS A 21 CE1	2.42
HIS A 21 NE2	2.11

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Salt bridges:
ASP A 18	HIS A 21	3.002	INTRA-CHAIN

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Van der Waal's Interactions:
ASP A 18 OD2 84	HIS A 21 NE2 106	-0.285	INTRA-CHAIN
ALA A 20 CB 96	HIS A 21 NE2 106	-0.042	INTRA-CHAIN