Structural features of residue 21 in chain A

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Electrostatic Interactions:
ARG A 19 NH1	HIS A 21 NE2	2.417	INTRA-CHAIN
ARG A 19 NH2	HIS A 21 NE2	2.384	INTRA-CHAIN
HIS A 21 ND1	ARG A 19 NH1	2.584	INTRA-CHAIN
HIS A 21 ND1	ASP A 24 OD1	-3.456	INTRA-CHAIN
HIS A 21 ND1	ASP A 28 OD1	-1.831	INTRA-CHAIN
HIS A 21 ND1	ARG A 64 NH1	2.436	INTRA-CHAIN
HIS A 21 ND1	ASP C 83 OD1	-2.179	INTER-CHAIN
HIS A 21 ND1	ARG C 87 NH1	2.858	INTER-CHAIN
HIS A 21 ND1	ARG A 110 NH1	3.137	INTRA-CHAIN
HIS A 21 ND1	ARG B 140 NH1	5.097	INTER-CHAIN
HIS A 21 ND1	ASP B 142 OD1	-1.964	INTER-CHAIN
HIS A 21 ND1	HIS B 145 ND1	0.734	INTER-CHAIN
HIS A 21 NE2	ARG A 19 NH1	2.417	INTRA-CHAIN
HIS A 21 NE2	ASP A 24 OD1	-3.337	INTRA-CHAIN
HIS A 21 NE2	ASP A 28 OD1	-2.004	INTRA-CHAIN
HIS A 21 NE2	ARG A 64 NH1	2.813	INTRA-CHAIN
HIS A 21 NE2	ASP C 83 OD1	-2.220	INTER-CHAIN
HIS A 21 NE2	ARG C 87 NH1	2.686	INTER-CHAIN
HIS A 21 NE2	ARG A 110 NH1	3.665	INTRA-CHAIN
HIS A 21 NE2	ARG B 140 NH1	6.507	INTER-CHAIN
HIS A 21 NE2	ASP B 142 OD1	-2.152	INTER-CHAIN
HIS A 21 NE2	HIS B 145 ND1	0.834	INTER-CHAIN
HIS A 21 NE2	HIS B 145 NE2	1.670	INTER-CHAIN
ASP A 24 OD1	HIS A 21 ND1	-3.456	INTRA-CHAIN
ASP A 24 OD2	HIS A 21 ND1	-3.570	INTRA-CHAIN
ASP A 28 OD1	HIS A 21 ND1	-1.831	INTRA-CHAIN
ASP A 28 OD2	HIS A 21 ND1	-1.959	INTRA-CHAIN
ARG A 64 NH1	HIS A 21 NE2	2.813	INTRA-CHAIN
ARG A 64 NH2	HIS A 21 NE2	3.445	INTRA-CHAIN
ARG A 110 NH1	HIS A 21 NE2	3.665	INTRA-CHAIN
ARG A 110 NH2	HIS A 21 NE2	3.401	INTRA-CHAIN
ARG B 140 NH1	HIS A 21 NE2	6.507	INTER-CHAIN
ARG B 140 NH2	HIS A 21 NE2	7.002	INTER-CHAIN
ASP B 142 OD1	HIS A 21 ND1	-1.964	INTER-CHAIN
ASP B 142 OD2	HIS A 21 ND1	-1.642	INTER-CHAIN
HIS B 145 ND1	HIS A 21 ND1	0.734	INTER-CHAIN
HIS B 145 ND1	HIS A 21 NE2	1.877	INTER-CHAIN
HIS B 145 NE2	HIS A 21 NE2	1.670	INTER-CHAIN
ASP C 83 OD1	HIS A 21 ND1	-2.179	INTER-CHAIN
ASP C 83 OD2	HIS A 21 ND1	-2.411	INTER-CHAIN
ARG C 87 NH1	HIS A 21 NE2	2.686	INTER-CHAIN
ARG C 87 NH2	HIS A 21 NE2	2.525	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|      B|         H|       21|      A|
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Protrusion Index:
HIS A 21 N	0.62
HIS A 21 CA	0.67
HIS A 21 C	0.75
HIS A 21 O	0.58
HIS A 21 CB	0.62
HIS A 21 CG	0.67
HIS A 21 ND1	0.95
HIS A 21 CD2	0.59
HIS A 21 CE1	1.04
HIS A 21 NE2	0.75

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Van der Waal's Interactions:
ALA A 20 CB 138	HIS A 21 NE2 148	-0.112	INTRA-CHAIN
HIS A 21 NE2 148	ASP A 24 OD2 165	-0.037	INTRA-CHAIN
HIS A 21 NE2 148	SER B 139 OG 986	-0.086	INTER-CHAIN
HIS A 21 NE2 148	ARG B 140 NH2 997	-0.103	INTER-CHAIN
HIS A 21 NE2 148	GLY B 143 O 1013	-0.018	INTER-CHAIN
HIS A 21 NE2 148	SER B 147 OG 1037	-0.074	INTER-CHAIN
HIS A 21 NE2 148	SER B 148 OG 1043	-0.016	INTER-CHAIN