We plan to develop novel site-based models of transport through ion channels in biological membranes, with an emphasis on development of skills required for a career in quantitative biology. A deeper understanding of transport and gating in ion channels is key to understanding the basic operation of ion channels and the effects of drug and illness on the nervous system. Recent discovery of the x-ray structure of the K+ ion channel from Streptomyces lividans makes this work especially timely. Using the x-ray structure, the energy profile of a test particle will be determined within the selectivity filter of the ion channel Ion fluxes determined by patch-clamp recording will be used to derive parameters used in the site model of transport through single-file channels at low ionic concentrations. The site model will need to account for an externally imposed electric field in a manner consistent with the Poisson equation,. Current voltage relationships predicted by this single ion site model will be compared with experiment and continuum theories, e.g. (PNP). The site model will be modified to allow for electrostatic interactions between multiple ions in the channel. The predictions of this model will then be compared with patch clamp experiments and PNP theory at higher ionic strengths.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Postdoctoral Individual National Research Service Award (F32)
Project #
3F32GM020584-02S1
Application #
6544642
Study Section
Physical Biochemistry Study Section (PB)
Program Officer
Flicker, Paula F
Project Start
2000-05-01
Project End
Budget Start
2001-11-01
Budget End
2002-04-30
Support Year
2
Fiscal Year
2002
Total Cost
$20,998
Indirect Cost
Name
University of Massachusetts Amherst
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
153223151
City
Amherst
State
MA
Country
United States
Zip Code
01003
Nelson, Peter Hugo (2017) Osmosis and thermodynamics explained by solute blocking. Eur Biophys J 46:59-64