Structural features of residue 21 in chain B

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Electrostatic Interactions:
ARG A 140 NH1	HIS B 21 NE2	7.578	INTER-CHAIN
ARG A 140 NH2	HIS B 21 NE2	7.226	INTER-CHAIN
ARG B 19 NH1	HIS B 21 NE2	2.430	INTRA-CHAIN
ARG B 19 NH2	HIS B 21 NE2	2.374	INTRA-CHAIN
HIS B 21 ND1	ARG B 19 NH1	2.851	INTRA-CHAIN
HIS B 21 ND1	ASP B 24 OD1	-5.361	INTRA-CHAIN
HIS B 21 ND1	ASP B 28 OD1	-2.522	INTRA-CHAIN
HIS B 21 ND1	HIS B 62 ND1	0.713	INTRA-CHAIN
HIS B 21 ND1	ARG B 64 NH1	3.035	INTRA-CHAIN
HIS B 21 ND1	ARG B 70 NH1	2.500	INTRA-CHAIN
HIS B 21 ND1	ASP C 83 OD1	-2.967	INTER-CHAIN
HIS B 21 ND1	ARG B 110 NH1	4.107	INTRA-CHAIN
HIS B 21 ND1	ARG A 140 NH1	8.016	INTER-CHAIN
HIS B 21 NE2	ARG B 19 NH1	2.430	INTRA-CHAIN
HIS B 21 NE2	ASP B 24 OD1	-3.497	INTRA-CHAIN
HIS B 21 NE2	ASP B 28 OD1	-2.185	INTRA-CHAIN
HIS B 21 NE2	ARG B 64 NH1	3.025	INTRA-CHAIN
HIS B 21 NE2	ARG B 70 NH1	2.681	INTRA-CHAIN
HIS B 21 NE2	ASP C 83 OD1	-2.310	INTER-CHAIN
HIS B 21 NE2	ARG B 110 NH1	4.084	INTRA-CHAIN
HIS B 21 NE2	ARG A 140 NH1	7.578	INTER-CHAIN
ASP B 24 OD1	HIS B 21 ND1	-5.361	INTRA-CHAIN
ASP B 24 OD2	HIS B 21 ND1	-7.171	INTRA-CHAIN
ASP B 28 OD1	HIS B 21 ND1	-2.522	INTRA-CHAIN
ASP B 28 OD2	HIS B 21 ND1	-2.766	INTRA-CHAIN
HIS B 62 ND1	HIS B 21 ND1	0.713	INTRA-CHAIN
ARG B 64 NH1	HIS B 21 NE2	3.025	INTRA-CHAIN
ARG B 64 NH2	HIS B 21 NE2	3.826	INTRA-CHAIN
ARG B 70 NH1	HIS B 21 NE2	2.681	INTRA-CHAIN
ARG B 70 NH2	HIS B 21 NE2	2.610	INTRA-CHAIN
ARG B 110 NH1	HIS B 21 NE2	4.084	INTRA-CHAIN
ARG B 110 NH2	HIS B 21 NE2	3.665	INTRA-CHAIN
ASP C 83 OD1	HIS B 21 ND1	-2.967	INTER-CHAIN
ASP C 83 OD2	HIS B 21 ND1	-3.435	INTER-CHAIN

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Hydrogen bonds:

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|Res1 type| Res1 No.| Chain1| Res2 type| Res2 No.| Chain2|
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|        R|      140|      A|         H|       21|      B|
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Protrusion Index:
HIS B 21 N	0.80
HIS B 21 CA	0.86
HIS B 21 C	0.77
HIS B 21 O	0.67
HIS B 21 CB	0.78
HIS B 21 CG	0.83
HIS B 21 ND1	0.60
HIS B 21 CD2	0.98
HIS B 21 CE1	0.74
HIS B 21 NE2	1.02

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Van der Waal's Interactions:
ALA B 20 CB 209	HIS B 21 NE2 219	-0.167	INTRA-CHAIN
HIS B 21 NE2 219	ASP B 24 OD2 239	-0.067	INTRA-CHAIN
HIS B 21 NE2 219	SER A 139 OG 1080	-0.012	INTER-CHAIN
HIS B 21 NE2 219	ARG A 140 NH2 1091	-0.124	INTER-CHAIN