Structural features of residue 21 in chain A

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Hydrogen bonds:

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|Res1 type| Res1 No.| Chain1| Res2 type| Res2 No.| Chain2|
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|        A|       21|      A|         A|       55|      B|
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|        A|       21|      B|         A|       55|      A|
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|        R|       22|      B|         A|       21|      A|
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Hydrophobic Interactions:
LEU A 17	ALA A 21	Dist=5.681	INTRA-CHAIN
ALA A 21	ALA B 55	Dist=4.499	INTER-CHAIN
ALA A 21	ILE B 57	Dist=5.187	INTER-CHAIN

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Protrusion Index:
ALA A 21 N	0.44
ALA A 21 CA	0.34
ALA A 21 C	0.51
ALA A 21 O	0.53
ALA A 21 CB	0.28

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Van der Waal's Interactions:
LEU A 17 CD2 110	ALA A 21 CB 135	-0.032	INTRA-CHAIN
GLY A 19 O 122	ALA A 21 CB 135	-0.007	INTRA-CHAIN
ALA A 21 CB 135	ARG B 22 NH2 1306	-0.304	INTER-CHAIN
ALA A 21 CB 135	ARG A 22 NH2 146	-0.011	INTRA-CHAIN
ALA A 21 CB 135	GLY A 54 O 383	-0.015	INTRA-CHAIN
ALA A 21 CB 135	ALA B 55 CB 1548	-0.126	INTER-CHAIN