Understanding proteins and their complexes using small angle X-ray/neutron scattering

AEI 12

Fnu Ashish, ashish@uncc.edu, Department of Chemistry, University of North Carolina at Charlotte, 9201 University City Blvd, Rm 247 Burson, Charlotte, NC 28213 and Joanna Krueger, jkkruege@email.uncc.edu, Department of Chemistry, University of North Carolina, Charlotte, 9201 University city Blvd, Charlotte, NC 28223-0001.
My teaching and research interests are aimed at understanding structure-function relationship of protein complexes employing data primarily obtained from small angle x-ray/neutron scattering (SAXS/SANS). Using relatively small sample volumes, one can reliably decipher global structural changes in biomolecules by SAXS-data analysis and ab initio structure reconstruction. Currently, we focus on protein systems with high biological relevance but lacking key structural insights from crystallography or NMR or EM. Novelty and prowess of this approach, in solving challenging biophysical problems, is evident from our results addressing large scale shape changes accompanying Ca2+-activation of gelsolin, and binding of HIV-1 gp120 to its receptor CD4. To decipher shape profiles of individual components while they reside in a complex, we combine the differences in the SANS properties of hydrogen and deuterium with the constitutional contrast in hydrogen content of a protein and its ligand.