Gaining Confidence in the Elusive Histidine Phosphoproteome
Journal
Analytical Chemistry
Journal Volume
91
Journal Issue
9
Pages
5542-5547
Date Issued
2019
Author(s)
Abstract
Recent technological advances have made it possible to investigate the hitherto rather elusive protein histidine phosphorylation. However, confident site-specific localization of protein histidine phosphorylation remains challenging. Here, we address this problem, presenting a mass-spectrometry-based approach that outperforms classical HCD fragmentation without compromising sensitivity. We use the phosphohistidine immonium ion as a diagnostic tool as well as ETD-based fragmentation techniques to achieve unambiguous identification and localization of histidine-phosphorylation sites. The work presented here will allow more confident investigation of the phosphohistidine proteome to reveal the roles of histidine phosphorylation in cellular signaling events.
Publisher
American Chemical Society
Type
journal article