Structural features of residue 21 in chain A

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Electrostatic Interactions:
ARG A 14 NH1	HIS A 21 NE2	6.808	INTRA-CHAIN
ARG A 14 NH2	HIS A 21 NE2	6.319	INTRA-CHAIN
HIS A 21 ND1	ARG A 14 NH1	7.677	INTRA-CHAIN
HIS A 21 ND1	HIS A 23 ND1	0.792	INTRA-CHAIN
HIS A 21 ND1	HIS A 23 NE2	1.776	INTRA-CHAIN
HIS A 21 ND1	HIS B 23 ND1	1.986	INTER-CHAIN
HIS A 21 ND1	HIS B 23 NE2	3.515	INTER-CHAIN
HIS A 21 NE2	ARG A 14 NH1	6.808	INTRA-CHAIN
HIS A 21 NE2	HIS A 23 ND1	0.773	INTRA-CHAIN
HIS A 21 NE2	HIS A 23 NE2	1.774	INTRA-CHAIN
HIS A 21 NE2	HIS B 23 ND1	1.421	INTER-CHAIN
HIS A 21 NE2	HIS B 23 NE2	2.768	INTER-CHAIN
HIS A 23 ND1	HIS A 21 ND1	0.792	INTRA-CHAIN
HIS A 23 ND1	HIS A 21 NE2	1.739	INTRA-CHAIN
HIS A 23 NE2	HIS A 21 ND1	0.789	INTRA-CHAIN
HIS A 23 NE2	HIS A 21 NE2	1.774	INTRA-CHAIN
HIS B 23 ND1	HIS A 21 ND1	1.986	INTER-CHAIN
HIS B 23 ND1	HIS A 21 NE2	3.197	INTER-CHAIN
HIS B 23 NE2	HIS A 21 ND1	1.562	INTER-CHAIN
HIS B 23 NE2	HIS A 21 NE2	2.768	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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|        H|       23|      B|         H|       21|      A|
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Protrusion Index:
HIS A 21 N	0.29
HIS A 21 CA	0.23
HIS A 21 C	0.18
HIS A 21 O	0.18
HIS A 21 CB	0.15
HIS A 21 CG	0.19
HIS A 21 ND1	0.32
HIS A 21 CD2	0.18
HIS A 21 CE1	0.41
HIS A 21 NE2	0.30

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Salt bridges:
GLU A 20	HIS A 21	2.237	INTRA-CHAIN

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Van der Waal's Interactions:
ARG A 14 NH2 114	HIS A 21 NE2 163	-0.056	INTRA-CHAIN
HIS A 21 NE2 163	SER A 51 OG 404	-1.838	INTRA-CHAIN
HIS A 21 NE2 163	TRP A 53 CH2 426	-0.068	INTRA-CHAIN
HIS A 21 NE2 163	ALA B 62 CB 985	-0.013	INTER-CHAIN
HIS A 21 NE2 163	SER B 63 OG 991	-0.014	INTER-CHAIN