Compressibility as a means to detect and characterize globular protein states.

AUTOR(ES)

Chalikian, T V

RESUMO

We report compressibility data on single-domain, globular proteins which suggest a general relationship between protein conformational transitions and delta kzeroS, the change in the partial specific adiabatic compressibility which accompanies the transition. Specifically, we find transitions between native and compact intermediate states to be accompanied by small increases in kzeroS of +(1-4) x 10(-6) cm3.g-1.bar-1 (1 bar = 100 kPa). By contrast, transitions between native and partially unfolded states are accompanied by small decreases in kzeroS of -(3-7) x 10(-6) cm3.g-1.bar-1, while native-to-fully unfolded transitions result in large decreases in kzeroS of -(18-20) x 10(-6) cm3.g-1.bar-1. Thus, for the single-domain, globular proteins studied here, changes in kzeroS correlate with the type of transition being monitored, independent of the specific protein. Consequently, kzeroS measurements may provide a convenient approach for detecting the existence of and for defining the nature of protein transitions, while also characterizing the hydration properties of individual protein states.

Documentos Relacionados

• Adiabatic compressibility of globular proteins.
• Protein stability: electrostatics and compact denatured states.
• Stress Responses as a Tool To Detect and Characterize the Mode of Action of Antibacterial Agents
• Experimental background to immune deficiency states.
• Albumin and gamma-globulin tracer studies in protein depletion states.