Abstract
RecA protein is capable of forming homo-oligomers in solution. The oligomeric and monomeric states of Thermus thermophilus RecA protein were studied by small angle X-ray scattering, a direct method used to measure the overall dimensions of a macromolecule. In the presence of 3 M urea or 0.2 M lithium perchlorate, RecA dissociates from higher oligomeric states to form a hexamer with a radius of gyration ( R g) of 52 Å. The value of R g decreased to 36 Å at a higher lithium perchlorate concentration (1.0 M). The zero angle intensity, I(0), was consistent with the identification of the former state as a hexamer and the latter as a monomer.
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