Probing the Binding Interfaces of Protein Complexes Using Gas-Phase H/D Exchange Mass Spectrometry

Ulrik H Mistarz, Jeffery M Brown, Kim F Haselmann, Kasper D Rand

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

34 Citationer (Scopus)

Abstract

Fast gas-phase hydrogen/deuterium exchange mediated by ND3 gas and measured by mass spectrometry (gas-phase HDX-MS) is a largely unharnessed, fast, and sensitive method for probing primary- and higher-order polypeptide structure. Labeling of heteroatom-bound non-amide hydrogens in a sub-millisecond time span after electrospray ionization by ND3 gas can provide structural insights into protein conformers present in solution. Here, we have explored the use of gas-phase HDX-MS for probing the higher-order structure and binding interfaces of protein complexes originating from native solution conditions. Lysozyme ions bound by an oligosaccharide incorporated less deuterium than the unbound ion. Similarly, trypsin ions showed reduced deuterium uptake when bound by the peptide ligand vasopressin. Our results are in good agreement with crystal structures of the native protein complexes, and illustrate that gas-phase HDX-MS can provide a sensitive and simple approach to measure the number of heteroatom-bound non-amide side-chain hydrogens involved in the binding interface of biologically relevant protein complexes.

OriginalsprogEngelsk
TidsskriftStructure
Vol/bind24
Udgave nummer2
Sider (fra-til)310-318
Antal sider9
ISSN0969-2126
DOI
StatusUdgivet - 2 feb. 2016

Citationsformater