Solution structure of the Tn3 resolvase-crossover site synaptic complex

Nöllmann, M., He, J., Byron, O. and Stark, W. M. (2004) Solution structure of the Tn3 resolvase-crossover site synaptic complex. Molecular Cell, 16(1), pp. 127-137. (doi: 10.1016/j.molcel.2004.09.027) (PMID:15469828)

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Tn3 resolvase is a site-specific DNA recombinase, which catalyzes strand exchange in a synaptic complex containing twelve resolvase subunits and two res sites. Hyperactive mutants of resolvase can form a simpler complex (X synapse) containing a resolvase tetramer and two shorter DNA segments at which strand exchange takes place (site I). We have solved the low-resolution solution structure of the purified, catalytically competent X synapse from small-angle neutron and X-ray scattering data, using methods in which the data are fitted with models constructed by rigid body transformations of a published crystallographic structure of a resolvase dimer bound to site I. Our analysis reveals that the two site I fragments are on the outside of a resolvase tetramer core and provides some information on the quaternary structure of the tetramer. We discuss implications of our structure for the architecture of the natural synaptic complex and the mechanism of strand exchange.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Byron, Professor Olwyn and Stark, Professor Marshall and Nollmann, Marcelo
Authors: Nöllmann, M., He, J., Byron, O., and Stark, W. M.
College/School:College of Medical Veterinary and Life Sciences > Institute of Molecular Cell and Systems Biology
College of Medical Veterinary and Life Sciences > School of Life Sciences
Journal Name:Molecular Cell
Publisher:Elsevier (Cell Press)
ISSN (Online):1097-4164
Published Online:07 October 2004

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