Structural features of residue 21 in chain A

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Electrostatic Interactions:
ARG A 19 NH1	HIS A 21 NE2	2.665	INTRA-CHAIN
ARG A 19 NH2	HIS A 21 NE2	2.313	INTRA-CHAIN
HIS A 21 ND1	ARG A 19 NH1	2.729	INTRA-CHAIN
HIS A 21 ND1	ASP A 22 OD1	-2.968	INTRA-CHAIN
HIS A 21 ND1	ASP A 24 OD1	-3.481	INTRA-CHAIN
HIS A 21 ND1	ASP A 28 OD1	-1.929	INTRA-CHAIN
HIS A 21 ND1	ARG A 64 NH1	2.564	INTRA-CHAIN
HIS A 21 ND1	ASP B 83 OD1	-2.213	INTER-CHAIN
HIS A 21 ND1	ARG B 87 NH1	2.612	INTER-CHAIN
HIS A 21 ND1	ARG A 110 NH1	3.338	INTRA-CHAIN
HIS A 21 ND1	ARG C 140 NH1	5.477	INTER-CHAIN
HIS A 21 ND1	ASP C 142 OD1	-1.450	INTER-CHAIN
HIS A 21 NE2	ARG A 19 NH1	2.665	INTRA-CHAIN
HIS A 21 NE2	ASP A 22 OD1	-2.310	INTRA-CHAIN
HIS A 21 NE2	ASP A 24 OD1	-3.562	INTRA-CHAIN
HIS A 21 NE2	ASP A 28 OD1	-2.157	INTRA-CHAIN
HIS A 21 NE2	ARG A 64 NH1	2.965	INTRA-CHAIN
HIS A 21 NE2	ARG A 70 NH1	2.414	INTRA-CHAIN
HIS A 21 NE2	ASP B 83 OD1	-2.383	INTER-CHAIN
HIS A 21 NE2	ARG B 87 NH1	2.592	INTER-CHAIN
HIS A 21 NE2	ARG A 110 NH1	3.852	INTRA-CHAIN
HIS A 21 NE2	ARG C 140 NH1	7.764	INTER-CHAIN
HIS A 21 NE2	ASP C 142 OD1	-1.531	INTER-CHAIN
ASP A 22 OD1	HIS A 21 ND1	-2.968	INTRA-CHAIN
ASP A 22 OD2	HIS A 21 ND1	-2.706	INTRA-CHAIN
ASP A 24 OD1	HIS A 21 ND1	-3.481	INTRA-CHAIN
ASP A 24 OD2	HIS A 21 ND1	-3.853	INTRA-CHAIN
ASP A 28 OD1	HIS A 21 ND1	-1.929	INTRA-CHAIN
ASP A 28 OD2	HIS A 21 ND1	-2.079	INTRA-CHAIN
ARG A 64 NH1	HIS A 21 NE2	2.965	INTRA-CHAIN
ARG A 64 NH2	HIS A 21 NE2	3.708	INTRA-CHAIN
ARG A 70 NH1	HIS A 21 NE2	2.414	INTRA-CHAIN
ARG A 70 NH2	HIS A 21 NE2	2.808	INTRA-CHAIN
ARG A 110 NH1	HIS A 21 NE2	3.852	INTRA-CHAIN
ARG A 110 NH2	HIS A 21 NE2	3.481	INTRA-CHAIN
ASP B 83 OD1	HIS A 21 ND1	-2.213	INTER-CHAIN
ASP B 83 OD2	HIS A 21 ND1	-2.387	INTER-CHAIN
ARG B 87 NH1	HIS A 21 NE2	2.592	INTER-CHAIN
ARG B 87 NH2	HIS A 21 NE2	2.394	INTER-CHAIN
ARG C 140 NH1	HIS A 21 NE2	7.764	INTER-CHAIN
ARG C 140 NH2	HIS A 21 NE2	7.772	INTER-CHAIN
ASP C 142 OD1	HIS A 21 ND1	-1.450	INTER-CHAIN
ASP C 142 OD2	HIS A 21 ND1	-1.647	INTER-CHAIN

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Protrusion Index:
HIS A 21 N	0.83
HIS A 21 CA	0.88
HIS A 21 C	0.81
HIS A 21 O	0.69
HIS A 21 CB	0.81
HIS A 21 CG	0.86
HIS A 21 ND1	1.24
HIS A 21 CD2	0.74
HIS A 21 CE1	1.22
HIS A 21 NE2	0.95

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Van der Waal's Interactions:
ALA A 20 CB 138	HIS A 21 NE2 148	-0.148	INTRA-CHAIN
HIS A 21 NE2 148	ASP A 24 OD2 168	-0.075	INTRA-CHAIN
HIS A 21 NE2 148	SER C 139 OG 3007	-0.017	INTER-CHAIN
HIS A 21 NE2 148	ARG C 140 NH2 3018	-0.192	INTER-CHAIN
HIS A 21 NE2 148	GLY C 143 O 3034	-0.039	INTER-CHAIN