Table 1 The secondary structure contributions to the amide I normal modes are resolved in the six frequency ranges derived from the doorway state analysis.

From: Crowding alters F-actin secondary structure and hydration

Region

Doorway range (cm−1)

Helix (%)

Sheet (%)

Loop (%)

R1

<1640

3.8

73.9

22.2

R2

1640–1650

36.4

20.2

43.4

R3

1650–1660

62.4

15.0

22.6

R4

1660–1670

56.7

12.3

31.1

R5

1670–1680

37.7

14.9

47.4

R6

>1680

25.0

13.4

61.6

  1. Secondary structure assignments are obtained from the PDB file 6BNO. For simplicity, all non-helical and non-sheet residues are defined as loop structures.
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