Structural features of residue 21 in chain A

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Electrostatic Interactions:
ASP A 18 OD1	HIS A 21 ND1	-3.479	INTRA-CHAIN
ASP A 18 OD2	HIS A 21 ND1	-4.538	INTRA-CHAIN
HIS A 21 ND1	ASP A 18 OD1	-3.479	INTRA-CHAIN
HIS A 21 ND1	ASP B 199 OD1	-1.362	INTER-CHAIN
HIS A 21 NE2	ASP A 18 OD1	-3.691	INTRA-CHAIN
HIS A 21 NE2	ASP B 199 OD1	-1.544	INTER-CHAIN
HIS A 21 NE2	ARG B 201 NH1	2.122	INTER-CHAIN
ASP A 66 OD2	HIS A 21 ND1	-1.405	INTRA-CHAIN
ASP B 199 OD1	HIS A 21 ND1	-1.362	INTER-CHAIN
ASP B 199 OD2	HIS A 21 ND1	-1.478	INTER-CHAIN
ARG B 201 NH1	HIS A 21 NE2	2.122	INTER-CHAIN

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Protrusion Index:
HIS A 21 N	0.95
HIS A 21 CA	1.06
HIS A 21 C	0.84
HIS A 21 O	0.78
HIS A 21 CB	1.00
HIS A 21 CG	1.51
HIS A 21 ND1	1.89
HIS A 21 CD2	1.54
HIS A 21 CE1	2.53
HIS A 21 NE2	2.16

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Salt bridges:
ASP A 18	HIS A 21	2.886	INTRA-CHAIN

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Van der Waal's Interactions:
ASP A 18 OD2 98	HIS A 21 NE2 120	-0.462	INTRA-CHAIN
ALA A 20 CB 110	HIS A 21 NE2 120	-0.041	INTRA-CHAIN