Authors: Giovanni Renzone,; Anna Maria Salzano,; Simona Arena,; Chiara D'Ambrosio,; Andrea Scaloni,

Source: Current Proteomics, Volume 4, Number 1, April 2007 , pp. 1-16(16)

Publisher: Bentham Science Publishers

Abstract:

Almost two decades after the introduction of the electrospray ionization (ESI) and the matrix-assisted laser desorption ionization (MALDI) techniques, mass spectrometry (MS) has become a key technology in the emerging field of proteomics. MS-based procedures combined with various affinity-trapping methods allowed massive identification of constitutive elements in multi-protein complexes from different organisms. Similarly, various MS-based strategies have been developed and applied to low-resolution structural studies on protein and protein complex. In fact, products generated either by limited proteolysis, selective chemical modification or radical probe reactions performed on isolated proteins have been characterized by ESI and MALDI techniques, providing information on the location of residues accessible on molecular surface. Differential experiments performed before and following complex formation allowed the identification of masked regions in each component of the complex after binding, generated as a result of macromolecular interaction. Similarly, MS analysis of protein complex cross-linking products has led to the identification of spatially closed amino acids occurring at molecular interface. Nowadays, these methodologies are used for experimental validation of insilico generated models and verification of interface regions predicted by bioinformatics computations. Accordingly, these approaches present a fundamental resource when severe limitations using high-resolution methods, such as X-ray crystallography or nuclear magnetic resonance (NMR) spectroscopy, which arise from the amount of sample required, difficulties in crystallization or solubilization, may hinder a definitive structural characterization. In this review, the combined use of chemical cross-linking, limited proteolysis, selective chemical modification or radical probe reactions with MS analysis is reviewed and discussed in the point of view of structural biology studies on protein and protein complexes.

Keywords: Protein complex; protein interaction; cross-linking; limited proteolysis; selective chemical modification; radical probe; molecular modelling

Document Type: Research article

DOI: http://dx.doi.org/10.2174/157016407781387384

Publication date: 2007-04-01

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• Current Proteomics research in the emerging field of proteomics is growing at an extremely rapid rate. The principal aim of Current Proteomics is to publish well-timed review articles in this fast-expanding area on topics relevant and significant to the development of proteomics. Current Proteomics is an essential journal for everyone involved in proteomics and related fields in both academia and industry.

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