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. 2021 Feb 26;11(15):8899–8915. doi: 10.1039/d1ra00870f

Secondary structure composition from amide I curve-fitting analysis.

Strain/variant Nonregular/coupling Turn/α-helix β-Sheet Nonregular
Frequency (cm−1) Width (cm−1) Area (%) Frequency (cm−1) Width (cm−1) Area (%) Frequency (cm−1) Width (cm−1) Area (%) Frequency (cm−1) Width (cm−1) Area (%)
PBS-2N4R 1640 35 19 1658 25 26 1672 17 37 1686 25 18
Tris-2N4R 1640 37 22 1657 22 16 1670 16 29 1680 31 33
PBS-2N4R (RNA) 1635 15 5 1657 23 29 1670 16 45 1687 27 21
Hepes-2N4R 1640 39 25 1656 18 12 1670 18 41 1685 27 22
HEPES-0N3R 1640 40 22 1663 27 27 1671 16 37 1688 23 14
HEPES-K18 1640 36 17 1659 21 19 1671 15 50 1683 26 14
HEPES-P301S 1640 32 21 1658 21 22 1671 15 30 1683 27 27