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. 2016 Sep 22;11(9):e0162031. doi: 10.1371/journal.pone.0162031

Table 8. A comparison of the estimated stretching and bending constants for the reduced state of the 4-Cys-[2Fe-2S] and Rieske structures, based on calculated normal modes.

	Force constant (reduced)
	4-Cys-[2Fe-2S]		Rieske
Mode	[mdyne/Å]	[kcal/molÅ²]	[mdyne/Å]	[kcal/molÅ²]
K(Fe-S(b)):His	1.353	195.	0.949	137.
K(Fe-S(b)):Cys	1.353	195.	0.874	126.
K(Fe-S(t))	0.587	84.	1.169	168.
K(Fe-N(t))	-	-	0.411	59.
H(Fe-S(b)-Fe)	0.303	44.	0.373	54.
H(S(b)-Fe-S(b))	0.410	59.	0.373	54.
H(S(b)-Fe-S(t))	0.460	66.	0.335	48.
H(S(t)-Fe-S(t))	0.460	66.	0.335	48.
H(S(b)-Fe-N(t))	-	-	0.401	58.
H(N(t)-Fe-N(t))	-	-	0.401	58.
K(Fe-Fe)	0.164	24.	0.246	35.

The notation K and H indicate stretching and bending, respectively.