Structural features of residue 21 in chain A

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Electrostatic Interactions:
ARG A 20 NH1	ARG A 21 NH1	4.768	INTRA-CHAIN
ARG A 20 NH1	ARG A 21 NH2	4.093	INTRA-CHAIN
ARG A 20 NH2	ARG A 21 NH1	5.483	INTRA-CHAIN
ARG A 20 NH2	ARG A 21 NH2	4.463	INTRA-CHAIN
ARG A 21 NH1	ARG B 20 NH1	3.354	INTER-CHAIN
ARG A 21 NH1	ARG A 20 NH1	4.768	INTRA-CHAIN
ARG A 21 NH1	ARG A 20 NH2	5.483	INTRA-CHAIN
ARG A 21 NH1	HIS A 51 NE2	2.970	INTRA-CHAIN
ARG A 21 NH2	ARG A 20 NH1	4.093	INTRA-CHAIN
ARG A 21 NH2	ARG A 20 NH2	4.463	INTRA-CHAIN
ARG A 21 NH2	HIS A 51 NE2	2.807	INTRA-CHAIN
HIS A 51 ND1	ARG A 21 NH1	3.135	INTRA-CHAIN
HIS A 51 NE2	ARG A 21 NH1	2.970	INTRA-CHAIN
ARG B 20 NH1	ARG A 21 NH1	3.354	INTER-CHAIN

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Protrusion Index:
ARG A 21 N	0.18
ARG A 21 CA	0.15
ARG A 21 C	0.26
ARG A 21 O	0.22
ARG A 21 CB	0.24
ARG A 21 CG	0.16
ARG A 21 CD	0.09
ARG A 21 NE	0.26
ARG A 21 CZ	0.36
ARG A 21 NH1	0.35
ARG A 21 NH2	0.58

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Salt bridges:
ASP A 17	ARG A 21	2.983	INTRA-CHAIN
ARG A 20	ARG A 21	2.843	INTRA-CHAIN

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Van der Waal's Interactions:
PRO A 18 CD 140	ARG A 21 NH2 169	-0.100	INTRA-CHAIN
LEU B 8 CD2 793	ARG A 21 NH2 169	-0.015	INTER-CHAIN
ASN B 9 ND2 801	ARG A 21 NH2 169	-0.093	INTER-CHAIN