Mutation of the iron ligand His 249 to Glu in the N-lobe of human transferrin abolishes the dilysine "trigger" but does not significantly affect iron release.
MacGillivray, R.T., Bewley, M.C., Smith, C.A., He, Q.Y., Mason, A.B.(2000) Biochemistry 39: 1211-1216
- PubMed: 10684598 
- DOI: 10.1021/bi991522y
- Primary Citation of Related Structures:  
1DTG - PubMed Abstract: 
Serum transferrin is the major iron transport protein in humans. Its function depends on its ability to bind iron with very high affinity, yet to release this bound iron at the lower intracellular pH. Possible explanations for the release of iron fro ...