Structural features of residue 21 in chain C

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Electrostatic Interactions:
ASP A 83 OD1	HIS C 21 ND1	-2.967	INTER-CHAIN
ASP A 83 OD2	HIS C 21 ND1	-3.435	INTER-CHAIN
ARG A 87 NH1	HIS C 21 NE2	2.566	INTER-CHAIN
ARG A 87 NH2	HIS C 21 NE2	2.378	INTER-CHAIN
ARG B 140 NH1	HIS C 21 NE2	7.579	INTER-CHAIN
ARG B 140 NH2	HIS C 21 NE2	7.227	INTER-CHAIN
ARG C 19 NH1	HIS C 21 NE2	2.431	INTRA-CHAIN
ARG C 19 NH2	HIS C 21 NE2	2.374	INTRA-CHAIN
HIS C 21 ND1	ARG C 19 NH1	2.851	INTRA-CHAIN
HIS C 21 ND1	ASP C 24 OD1	-5.361	INTRA-CHAIN
HIS C 21 ND1	ASP C 28 OD1	-2.522	INTRA-CHAIN
HIS C 21 ND1	HIS C 62 ND1	0.713	INTRA-CHAIN
HIS C 21 ND1	ARG C 64 NH1	3.035	INTRA-CHAIN
HIS C 21 ND1	ARG C 70 NH1	2.500	INTRA-CHAIN
HIS C 21 ND1	ASP A 83 OD1	-2.967	INTER-CHAIN
HIS C 21 ND1	ARG A 87 NH1	2.734	INTER-CHAIN
HIS C 21 ND1	ARG C 110 NH1	4.107	INTRA-CHAIN
HIS C 21 ND1	ARG B 140 NH1	8.017	INTER-CHAIN
HIS C 21 NE2	ARG C 19 NH1	2.431	INTRA-CHAIN
HIS C 21 NE2	ASP C 24 OD1	-3.498	INTRA-CHAIN
HIS C 21 NE2	ASP C 28 OD1	-2.185	INTRA-CHAIN
HIS C 21 NE2	ARG C 64 NH1	3.025	INTRA-CHAIN
HIS C 21 NE2	ARG C 70 NH1	2.681	INTRA-CHAIN
HIS C 21 NE2	ASP A 83 OD1	-2.310	INTER-CHAIN
HIS C 21 NE2	ARG A 87 NH1	2.566	INTER-CHAIN
HIS C 21 NE2	ARG C 110 NH1	4.084	INTRA-CHAIN
HIS C 21 NE2	ARG B 140 NH1	7.579	INTER-CHAIN
ASP C 24 OD1	HIS C 21 ND1	-5.361	INTRA-CHAIN
ASP C 24 OD2	HIS C 21 ND1	-7.171	INTRA-CHAIN
ASP C 28 OD1	HIS C 21 ND1	-2.522	INTRA-CHAIN
ASP C 28 OD2	HIS C 21 ND1	-2.766	INTRA-CHAIN
HIS C 62 ND1	HIS C 21 ND1	0.713	INTRA-CHAIN
ARG C 64 NH1	HIS C 21 NE2	3.025	INTRA-CHAIN
ARG C 64 NH2	HIS C 21 NE2	3.826	INTRA-CHAIN
ARG C 70 NH1	HIS C 21 NE2	2.681	INTRA-CHAIN
ARG C 70 NH2	HIS C 21 NE2	2.610	INTRA-CHAIN
ARG C 110 NH1	HIS C 21 NE2	4.084	INTRA-CHAIN
ARG C 110 NH2	HIS C 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|      B|         H|       21|      C|
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Protrusion Index:
HIS C 21 N	0.80
HIS C 21 CA	0.86
HIS C 21 C	0.77
HIS C 21 O	0.67
HIS C 21 CB	0.78
HIS C 21 CG	0.83
HIS C 21 ND1	0.60
HIS C 21 CD2	0.98
HIS C 21 CE1	0.74
HIS C 21 NE2	1.02

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Salt bridges:
HIS C 21	ARG B 140	3.109	INTER-CHAIN

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Van der Waal's Interactions:
ALA C 20 CB 209	HIS C 21 NE2 219	-0.167	INTRA-CHAIN
HIS C 21 NE2 219	ASP C 24 OD2 239	-0.067	INTRA-CHAIN
HIS C 21 NE2 219	ARG B 140 NH2 1091	-0.124	INTER-CHAIN
HIS C 21 NE2 219	GLY B 143 O 1107	-0.033	INTER-CHAIN