Structural features of residue 21 in chain C

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Electrostatic Interactions:
ARG A 87 NH1	HIS C 21 NE2	2.675	INTER-CHAIN
ARG A 87 NH2	HIS C 21 NE2	2.525	INTER-CHAIN
ARG B 140 NH1	HIS C 21 NE2	6.273	INTER-CHAIN
ARG B 140 NH2	HIS C 21 NE2	5.965	INTER-CHAIN
ASP B 142 OD1	HIS C 21 ND1	-1.606	INTER-CHAIN
ASP B 142 OD2	HIS C 21 ND1	-1.537	INTER-CHAIN
ARG C 19 NH1	HIS C 21 NE2	2.784	INTRA-CHAIN
ARG C 19 NH2	HIS C 21 NE2	2.433	INTRA-CHAIN
HIS C 21 ND1	ARG C 19 NH1	3.267	INTRA-CHAIN
HIS C 21 ND1	ASP C 28 OD1	-2.126	INTRA-CHAIN
HIS C 21 ND1	ARG C 64 NH1	2.547	INTRA-CHAIN
HIS C 21 ND1	ARG C 70 NH1	2.143	INTRA-CHAIN
HIS C 21 ND1	ARG A 87 NH1	2.998	INTER-CHAIN
HIS C 21 ND1	ARG C 110 NH1	3.227	INTRA-CHAIN
HIS C 21 ND1	ARG B 140 NH1	9.184	INTER-CHAIN
HIS C 21 ND1	ASP B 142 OD1	-1.606	INTER-CHAIN
HIS C 21 NE2	ARG C 19 NH1	2.784	INTRA-CHAIN
HIS C 21 NE2	ASP C 28 OD1	-1.930	INTRA-CHAIN
HIS C 21 NE2	ARG C 64 NH1	2.494	INTRA-CHAIN
HIS C 21 NE2	ARG C 70 NH1	2.149	INTRA-CHAIN
HIS C 21 NE2	ARG A 87 NH1	2.675	INTER-CHAIN
HIS C 21 NE2	ARG C 110 NH1	3.373	INTRA-CHAIN
HIS C 21 NE2	ARG B 140 NH1	6.273	INTER-CHAIN
HIS C 21 NE2	ASP B 142 OD1	-1.590	INTER-CHAIN
ASP C 28 OD1	HIS C 21 ND1	-2.126	INTRA-CHAIN
ASP C 28 OD2	HIS C 21 ND1	-2.139	INTRA-CHAIN
ARG C 64 NH1	HIS C 21 NE2	2.494	INTRA-CHAIN
ARG C 64 NH2	HIS C 21 NE2	2.980	INTRA-CHAIN
ARG C 70 NH1	HIS C 21 NE2	2.149	INTRA-CHAIN
ARG C 110 NH1	HIS C 21 NE2	3.373	INTRA-CHAIN
ARG C 110 NH2	HIS C 21 NE2	3.308	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	1.04
HIS C 21 CA	1.15
HIS C 21 C	1.00
HIS C 21 O	0.80
HIS C 21 CB	1.08
HIS C 21 CG	1.15
HIS C 21 ND1	0.95
HIS C 21 CD2	1.48
HIS C 21 CE1	1.08
HIS C 21 NE2	1.40

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Van der Waal's Interactions:
ALA C 20 CB 2164	HIS C 21 NE2 2174	-0.184	INTRA-CHAIN
HIS C 21 NE2 2174	ARG B 140 NH2 2005	-0.040	INTER-CHAIN