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On the molecular structure of human neuroserpin polymers

Proteins: Structure, Function and Bioinformatics, ISSN: 0887-3585, Vol: 80, Issue: 1, Page: 8-13
2012
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Article Description

The polymerization of serpins is at the root of a large class of diseases; the molecular structure of serpin polymers has been recently debated. In this work, we study the polymerization kinetics of human neuroserpin by Fourier Transform Infra Red spectroscopy and by time-lapse Size Exclusion Chromatography. First, we show that two distinct neuroserpin polymers, formed at 45 and 85°C, display the same isosbestic points in the Amide I′ band, and therefore share common secondary structure features. We also find a concentration independent polymerization rate at 45°C suggesting that the polymerization rate-limiting step is the formation of an activated monomeric species. The polymer structures are consistent with a model that predicts the bare insertion of portions of the reactive center loop into the A β-sheet of neighboring serpin molecule, although with different extents at 45 and 85°C. © 2011 Wiley Periodicals, Inc.

Bibliographic Details

Santangelo, Maria Grazia; Noto, Rosina; Levantino, Matteo; Cupane, Antonio; Ricagno, Stefano; Pezzullo, Margherita; Bolognesi, Martino; Mangione, Maria Rosalia; Martorana, Vincenzo; Manno, Mauro

Wiley

Biochemistry, Genetics and Molecular Biology

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