Download MendeleyStructure of activated aconitase: formation of the [4Fe-4S] cluster in the crystal.
Robbins, A.H., Stout, C.D.(1989) Proc Natl Acad Sci U S A 86: 3639-3643
- PubMed: 2726740
- DOI: https://doi.org/10.1073/pnas.86.10.3639
- Primary Citation of Related Structures:
5ACN, 6ACN - PubMed Abstract:
The structure of activated pig heart aconitase [citrate(isocitrate) hydro-lyase, EC 4.2.1.3] containing a [4Fe-4S] cluster has been refined at 2.5-A resolution to a crystallographic residual of 18.2%. Comparison of this structure to the recently determined 2.1-A resolution structure of the inactive enzyme containing a [3Fe-4S] cluster, by difference Fourier analysis, shows that upon activation iron is inserted into the structure isomorphously. The common atoms of the [3Fe-4S] and [4Fe-4S] cores agree within 0.1 A; the three common cysteinyl S gamma ligand atoms agree within 0.25 A. The fourth ligand of the Fe inserted into the [3Fe-4S] cluster is a water or hydroxyl from solvent, consistent with the absence of a free cysteine ligand in the enzyme active site cleft and the isomorphism of the two structures. A water molecule occupies a similar site in the crystal structure of the inactive enzyme.
Organizational Affiliation:
Department of Molecular Biology, Research Institute of Scripps Clinic, La Jolla, CA 92037.
