Structural features of residue 21 in chain A

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Electrostatic Interactions:
ARG A 21 NH1	HIS B 47 NE2	3.500	INTER-CHAIN
ARG A 21 NH1	HIS A 63 NE2	4.445	INTRA-CHAIN
ARG A 21 NH1	HIS A 68 NE2	4.919	INTRA-CHAIN
ARG A 21 NH2	HIS B 47 NE2	4.594	INTER-CHAIN
ARG A 21 NH2	HIS A 63 NE2	4.839	INTRA-CHAIN
ARG A 21 NH2	HIS A 68 NE2	7.041	INTRA-CHAIN
HIS A 63 ND1	ARG A 21 NH1	4.036	INTRA-CHAIN
HIS A 63 NE2	ARG A 21 NH1	4.445	INTRA-CHAIN
HIS A 68 ND1	ARG A 21 NH1	6.819	INTRA-CHAIN
HIS A 68 NE2	ARG A 21 NH1	4.919	INTRA-CHAIN
HIS B 47 ND1	ARG A 21 NH1	2.945	INTER-CHAIN
HIS B 47 NE2	ARG A 21 NH1	3.500	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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|        Y|       46|      B|         R|       21|      A|
----------------------------------------------------------

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Protrusion Index:
ARG A 21 N	0.37
ARG A 21 CA	0.29
ARG A 21 C	0.23
ARG A 21 O	0.18
ARG A 21 CB	0.14
ARG A 21 CG	0.04
ARG A 21 CD	0.10
ARG A 21 NE	0.05
ARG A 21 CZ	0.13
ARG A 21 NH1	0.24
ARG A 21 NH2	0.07

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Salt bridges:
GLU A 20	ARG A 21	2.212	INTRA-CHAIN
ARG A 21	HIS A 68	2.806	INTRA-CHAIN

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Van der Waal's Interactions:
ARG A 21 NH2 176	PHE B 42 CZ 2382	-0.015	INTER-CHAIN
ARG A 21 NH2 176	TYR B 46 OH 2421	-0.080	INTER-CHAIN
ARG A 21 NH2 176	HIS B 47 NE2 2431	-0.008	INTER-CHAIN
ARG A 21 NH2 176	HIS A 63 NE2 515	-0.011	INTRA-CHAIN
ARG A 21 NH2 176	LEU A 64 CD2 523	-0.092	INTRA-CHAIN
ARG A 21 NH2 176	GLY A 67 O 542	-0.191	INTRA-CHAIN
ARG A 21 NH2 176	HIS A 68 NE2 552	-0.107	INTRA-CHAIN