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. 2017 Sep 18;117(19):12532–12563. doi: 10.1021/acs.chemrev.7b00295

Table 4. Summary of Stiffness of Heme Fe in Various Environments.

  stiffness (pN/pm) spin oxidation axial ligands ref
cyt c 322 ± 17 0 +2 His, Met (161)
cyt c 284 ± 17 1/2 +3 His, Met (161)
cyt f 342 ± 18 0 +2 His, N-term (164)
cyt f 313 ± 34 1/2 +3 His, N-term (164)
MbNO 368 ± 10 1/2 +2 His, NO (105)
Zn(II)–FeBMbNO 321 ± 21 1/2 +2 NO (165)
MbO2 371 ± 9 0 +2 His, O2 (123)
Ag(I)–CuBMbO2 373 ± 13 0 +2 His, O2 (123)
           
deoxyMb 190 ± 20 2 +2 His (160), (161)
Fe(II)–FeBMb 182 ± 9 2 +2 His (165)
metMb 235 ± 4 5/2 +2 His, H2O (123)
[Fe(P)(Cl)] 192 ± 2 5/2 +3 Cl– (38)
[Fe(OEP)(Cl)] 196 ± 6 5/2 +3 Cl– (38)
[Fe(PPIX)(Cl)] 197 ± 4 5/2 +3 Cl– (38)
[Fe(TPP)(2-MeHIm)] 188 ± 1 2 +2 2-MeHIm (138)
[Fe(TPP)(2-MeIm–)]− 171 ± 5 2 +2 2-MeIm– (138)