Multistep aggregation pathway of human interleukin-1 receptor antagonist: kinetic, structural, and morphological characterization.

Biophysical Journal
Sampathkumar Krishnan, Andrei A Raibekas

Abstract

The complex, multistep aggregation kinetic and structural behavior of human recombinant interleukin-1 receptor antagonist (IL-1ra) was revealed and characterized by spectral probes and techniques. At a certain range of protein concentration (12-27 mg/mL) and temperature (44-48 degrees C), two sequential aggregation kinetic transitions emerge, where the second transition is preceded by a lag phase and is associated with the main portion of the aggregated protein. Each kinetic transition is linked to a different type of aggregate population, referred to as type I and type II. The aggregate populations, isolated at a series of time points and analyzed by Fourier-transform infrared spectroscopy, show consecutive protein structural changes, from intramolecular (type I) to intermolecular (type II) beta-sheet formation. The early type I protein spectral change resembles that seen for IL-1ra in the crystalline state. Moreover, Fourier-transform infrared data demonstrate that type I protein assembly alone can undergo a structural rearrangement and, consequently, convert to the type II aggregate. The aggregated protein structural changes are accompanied by the aggregate morphological changes, leading to a well-defined population of inter...Continue Reading

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Apr 2, 2011·The Journal of Biological Chemistry·Marisa K JoubertLinda O Narhi
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