Structural features of residue 21 in chain A

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Electrostatic Interactions:
HIS A 21 ND1	ASP A 28 OD1	-2.522	INTRA-CHAIN
HIS A 21 ND1	HIS A 62 ND1	0.713	INTRA-CHAIN
HIS A 21 ND1	ARG A 64 NH1	3.035	INTRA-CHAIN
HIS A 21 ND1	ARG A 70 NH1	2.500	INTRA-CHAIN
HIS A 21 ND1	ARG A 110 NH1	4.107	INTRA-CHAIN
HIS A 21 NE2	ASP A 28 OD1	-2.185	INTRA-CHAIN
HIS A 21 NE2	ARG A 64 NH1	3.025	INTRA-CHAIN
HIS A 21 NE2	ARG A 70 NH1	2.681	INTRA-CHAIN
HIS A 21 NE2	ARG A 110 NH1	4.084	INTRA-CHAIN
ASP A 28 OD1	HIS A 21 ND1	-2.522	INTRA-CHAIN
ASP A 28 OD2	HIS A 21 ND1	-2.766	INTRA-CHAIN
HIS A 62 ND1	HIS A 21 ND1	0.713	INTRA-CHAIN
ARG A 64 NH1	HIS A 21 NE2	3.025	INTRA-CHAIN
ARG A 64 NH2	HIS A 21 NE2	3.826	INTRA-CHAIN
ARG A 70 NH1	HIS A 21 NE2	2.681	INTRA-CHAIN
ARG A 70 NH2	HIS A 21 NE2	2.610	INTRA-CHAIN
ARG A 110 NH1	HIS A 21 NE2	4.084	INTRA-CHAIN
ARG A 110 NH2	HIS A 21 NE2	3.665	INTRA-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|      C|         H|       21|      A|
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Protrusion Index:
HIS A 21 N	0.80
HIS A 21 CA	0.86
HIS A 21 C	0.77
HIS A 21 O	0.67
HIS A 21 CB	0.78
HIS A 21 CG	0.83
HIS A 21 ND1	0.60
HIS A 21 CD2	0.98
HIS A 21 CE1	0.74
HIS A 21 NE2	1.02

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Van der Waal's Interactions:
ALA A 20 CB 209	HIS A 21 NE2 219	-0.167	INTRA-CHAIN
HIS A 21 NE2 219	SER C 139 OG 1080	-0.012	INTER-CHAIN