Design of CID-cleavable Protein Cross-linkers: Identical Mass Modifications for Simpler Sequence Analysis

Overview

Journal Org Biomol Chem

Publisher Royal Society of Chemistry

Specialties Biochemistry
Chemistry

Date 2015 Aug 14

PMID 26269432

Citations 8

Authors

Wynne V Kandur

Athit Kao

Danielle Vellucci

Lan Huang

Scott D Rychnovsky

Affiliations

Soon will be listed here.

Abstract

The cross-linking Mass Spectrometry (XL-MS) technique has enormous potential for studying the interactions between proteins, and it can provide detailed structural information about the interaction interfaces in large protein complexes. Such information has been difficult to obtain by conventional structural methods. One of the primary impediments to the wider use of the XL-MS technique is the extreme challenge in sequencing cross-linked peptides because of their complex fragmentation patterns in MS. A recent innovation is the development of MS-cleavable cross-linkers, which allows direct sequencing of component peptides for facile identification. Sulfoxides are an intriguing class of thermally-cleavable compounds that have been shown to fragment selectively during low-energy collisional induced dissociation (CID) analysis. Current CID-cleavable cross-linkers create fragmentation patterns in MS(2) of multiple peaks for each cross-linked peptide. Reducing the complexity of the fragmentation pattern in MS(2) facilitates subsequent MS(3) sequencing of the cross-linked peptides. The first authentic identical mass linker (IML) has now been designed, prepared, and evaluated. Multistage tandem mass spectrometry (MS(n)) analysis has demonstrated that the IML cross-linked peptides indeed yield one peak per peptide constituent in MS(2) as predicted, thus allowing effective and sensitive MS(3) analysis for unambiguous identification. Selective fragmentation for IML cross-linked peptides from the 19S proteasome complex was observed, providing a proof-of-concept demonstration for XL-MS studies on protein complexes.

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