Received for publication, May 31, 2007, and in revised form, June 20, 2007 Published, JBC Papers in Press, June 21, 2007, DOI 10.1074/jbc.C700107200 Sandra E. Wiley, Mark L. Paddock, Edward C. Abresch, Larry Gross, Peter van der Geer , Rachel Nechushtai**, Anne N. Murphy, Patricia A. Jennings, and Jack E. Dixon From the Departments of Pharmacology, Physics, Chemistry and Biochemistry, and Cellu...