Metabolites of polychlorinated biphenyls (PCBs) bind with high affinity to uteroglobin, a small homodimeric protein that also binds progesterone. We present the solution structure of the reduced form of rat uteroglobin in complex with a PCB methylsulphone, (MeSO2)2-TCB ...
Metabolites of polychlorinated biphenyls (PCBs) bind with high affinity to uteroglobin, a small homodimeric protein that also binds progesterone. We present the solution structure of the reduced form of rat uteroglobin in complex with a PCB methylsulphone, (MeSO2)2-TCB. The structure reveals the molecular basis for the accumulation of (MeSO2)2-TCB by uteroglobin. The structure also shows how ligand binding and release might be controlled by reduction/oxidation of two intermolecular disulphide bonds. Breakage of these bonds induces a local unfolding of the N- and C-termini and a separation of helices creating a channel into the binding site. These effects make the ligand binding cavity readily accessible to entry of the ligand.
Related Citations:
Progesterone Binding to Uteroglobin: Two Alternative Conformations of the Ligand Dunkel, R., Vriend, G., Beato, M., Suske, G. (1995) Protein Eng 8: 71
Heterologous Expression of Human Uteroglobin (Slash) Polychlorinated Biphenyl-Binding Protein Andersson, O., Nordlund-Moeller, L., Barnes, H.J., Lund, J. (1994) J Biol Chem 269: 19081
Cloning, Structure, and Expression of a Rat Binding Protein for Polychlorinated Biphenyls Nordlund-Moeller, L., Andersson, O., Ahlgren, R., Schilling, J., Gillner, M., Gustafsson, J.-A., Lund, J. (1992) J Mol Biol 224: 442
Organizational Affiliation:
Center for Structural Biochemistry, Karolinska Institutet, NOVUM, Huddinge, Sweden.
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