Download MendeleyCrystal Structures of Artificial Metalloproteins: Tight Binding of Fe(III)(Schiff-Base) by Mutation of Ala71 to Gly in Apo-Myoglobin
Ueno, T., Ohashi, M., Kono, M., Kondo, K., Suzuki, A., Yamane, T., Watanabe, Y.(2004) Inorg Chem 43: 2852-2858
- PubMed: 15106972
- DOI: https://doi.org/10.1021/ic0498539
- Primary Citation of Related Structures:
1UFJ, 1UFP - PubMed Abstract:
Apo-myoglobin (apo-Mb) and apo-A71GMb were successfully reconstituted with FeIII(salophen) (1) (salophen = N,N'-bis(salicylidene)-1,2-phenilenediamine), Fe(III)(3,3'-Me2-salophen) (2), and FeIII(5,5'-t-Bu2-salophen) (3). The crystal structure of 2.apo-A71GMb shows the tight binding of the complex in the Mb cavity, while in wild-type apo-Mb it is highly disordered due to the steric repulsion with Ala71. Furthermore, the structure of 2.apo-A71GMb suggests a possible accommodation of a small substrate in the cavity. In fact, the cyanide association rate constant of 2.apo-A71GMb is 216-fold larger compared to that of 2.apo-Mb. These results provide us principles for the noncovalent fixation of synthetic metal cofactors at the desired positions in protein matrixes.
Organizational Affiliation:
Research Center for Materials Science, Nagoya University, Nagoya 464-8602, Japan.
