Covalent crosslinking in gas-phase biomolecular ions. An account and perspective
Literature Information
Photochemical crosslinking in gas-phase ion complexes has been introduced as a method to study biomolecular structures and dynamics. Emphasis has been on carbene-based crosslinking induced by photodissociation of diazirine-tagged ions. The features that characterize gas-phase crosslinking include (1) complex formation in electrospray droplets that allows for library-type screening; (2) well defined stoichiometry of the complexes due to mass-selective isolation; (3) facile reaction monitoring and yield determination, and (4) post-crosslinking structure analysis by tandem mass spectrometry that has been combined with hydrogen–deuterium exchange, UV-vis action spectroscopy, and ion mobility measurements. In this account, examples are given of peptide–peptide, peptide–nucleotide, and peptide–ligand crosslinking that chiefly used carbene-based reactions. The pros and cons of gas-phase crosslinking are discussed. Nitrile-imine based crosslinking in gas-phase ions is introduced as a promising new approach to ion structure analysis that offers high efficiency and has the potential for wide ranging applications.
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.













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