Structural features of residue 21 in chain C

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Electrostatic Interactions:
ARG B 140 NH1	HIS C 21 NE2	5.655	INTER-CHAIN
ARG B 140 NH2	HIS C 21 NE2	6.079	INTER-CHAIN
ARG C 19 NH1	HIS C 21 NE2	2.690	INTRA-CHAIN
ARG C 19 NH2	HIS C 21 NE2	2.364	INTRA-CHAIN
HIS C 21 ND1	ARG C 19 NH1	3.182	INTRA-CHAIN
HIS C 21 ND1	ASP C 28 OD1	-2.175	INTRA-CHAIN
HIS C 21 ND1	ARG C 64 NH1	2.663	INTRA-CHAIN
HIS C 21 ND1	ARG C 110 NH1	3.384	INTRA-CHAIN
HIS C 21 ND1	ARG B 140 NH1	6.674	INTER-CHAIN
HIS C 21 NE2	ARG C 19 NH1	2.690	INTRA-CHAIN
HIS C 21 NE2	ASP C 28 OD1	-1.954	INTRA-CHAIN
HIS C 21 NE2	ARG C 64 NH1	2.610	INTRA-CHAIN
HIS C 21 NE2	ARG C 110 NH1	3.494	INTRA-CHAIN
HIS C 21 NE2	ARG B 140 NH1	5.655	INTER-CHAIN
ASP C 28 OD1	HIS C 21 ND1	-2.175	INTRA-CHAIN
ASP C 28 OD2	HIS C 21 ND1	-2.385	INTRA-CHAIN
ARG C 64 NH1	HIS C 21 NE2	2.610	INTRA-CHAIN
ARG C 64 NH2	HIS C 21 NE2	3.205	INTRA-CHAIN
ARG C 110 NH1	HIS C 21 NE2	3.494	INTRA-CHAIN
ARG C 110 NH2	HIS C 21 NE2	3.670	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|      B|         H|       21|      C|
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Protrusion Index:
HIS C 21 N	0.98
HIS C 21 CA	1.19
HIS C 21 C	0.98
HIS C 21 O	0.77
HIS C 21 CB	1.29
HIS C 21 CG	1.48
HIS C 21 ND1	1.15
HIS C 21 CD2	1.89
HIS C 21 CE1	1.45
HIS C 21 NE2	2.02

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Van der Waal's Interactions:
ALA C 20 CB 2117	HIS C 21 NE2 2127	-0.128	INTRA-CHAIN
HIS C 21 NE2 2127	ARG B 140 NH2 1978	-0.044	INTER-CHAIN