Structural features of residue 21 in chain A

*********************************
Electrostatic Interactions:
ASP A 18 OD1	HIS A 21 ND1	-3.589	INTRA-CHAIN
ASP A 18 OD2	HIS A 21 ND1	-4.949	INTRA-CHAIN
HIS A 21 ND1	ASP A 18 OD1	-3.589	INTRA-CHAIN
HIS A 21 ND1	ASP B 199 OD1	-1.389	INTER-CHAIN
HIS A 21 NE2	ASP A 18 OD1	-3.709	INTRA-CHAIN
HIS A 21 NE2	ASP B 199 OD1	-1.591	INTER-CHAIN
HIS A 21 NE2	ARG B 201 NH1	2.139	INTER-CHAIN
ASP A 66 OD2	HIS A 21 ND1	-1.346	INTRA-CHAIN
ASP B 199 OD1	HIS A 21 ND1	-1.389	INTER-CHAIN
ASP B 199 OD2	HIS A 21 ND1	-1.531	INTER-CHAIN
ARG B 201 NH1	HIS A 21 NE2	2.139	INTER-CHAIN

*********************************
Protrusion Index:
HIS A 21 N	0.97
HIS A 21 CA	1.11
HIS A 21 C	0.83
HIS A 21 O	0.83
HIS A 21 CB	1.06
HIS A 21 CG	1.45
HIS A 21 ND1	2.11
HIS A 21 CD2	1.57
HIS A 21 CE1	2.59
HIS A 21 NE2	2.11

*********************************
Salt bridges:
ASP A 18	HIS A 21	2.878	INTRA-CHAIN

*********************************
Van der Waal's Interactions:
ASP A 18 OD2 89	HIS A 21 NE2 111	-0.545	INTRA-CHAIN
ALA A 20 CB 101	HIS A 21 NE2 111	-0.039	INTRA-CHAIN