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. Author manuscript; available in PMC: 2009 Oct 17.
Published in final edited form as: Biochem Biophys Res Commun. 2009 Mar 1;381(4):712–716. doi: 10.1016/j.bbrc.2009.02.133

Table 1.

First order rate constants for iron release from Tf N-lobe to pyrophosphate

Tf species kobs (× 103 s−1)
pH 7.4 TfNFe 0.76 ± 0.06
TfNFe-TfR 0.07 ± 0.01
TfNFe-TfR(stalk) 0.11 ± 0.03
pH 5.6 TfNFe 12.3 ± 1.1
TfNFe-TfR 4.0 ± 0.4
TfNFe-TfR(stalk) 5.9 ± 0.8

Pyrophosphate concentrations were 100 mM at pH 7.4 and 5 mM at pH 5.6.

The numbers show the mean values and standard deviations.