Table 2 Changes in backbone dihedral angles upon flipping from ground state to the opposite puckered state, given as averages and standard deviations across each proline class.

From: Hydroxyproline Ring Pucker Causes Frustration of Helix Parameters in the Collagen Triple Helix

Proline class*

Δϕ

Δψ

Avg

SD

Avg

SD

(PPG)12 PX

−11.08

0.18

6.90

0.32

(PPG)12 PY

−3.83

0.22

0.28

0.33

(POG)12 PX

−11.06

0.36

5.16

0.42

(POG)12 OY†

−5.85

1.97

1.94

0.85

  1. All values are in degrees.
  2. *For PY or OY the change in pucker is overwhelmingly exo to endo. For PX, the change in pucker can be either way depending on whether the ground state is endo or exo.
  3. †Two distinct populations of changes in backbone dihedral angles were observed for (POG)12 OY, with Δϕ centred at −4.6° and −9.5°.
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