Dissociation energies of X–H bonds in amino acids
文献情報
Benjamin N. Moore, Ryan R. Julian
In biochemistry, free radicals are versatile species which can perform diverse functions including: signaling, synthesis, and destructive modification. It is of interest to understand how radicals behave within all biomolecules and specifically within peptides and proteins. The 20 standard amino acids contain a wide range of chemical structures, which give proteins their complexity and ultimately their functionality. Many factors influence how radicals interact with these complex molecules, including the bond dissociation energies (BDEs) for homolytically cleaving any X–H bonds. The BDEs provide a simple measure for comparing the thermodynamic favorability of abstracting hydrogen atoms from various sites within a protein. BDEs for abstractable hydrogen atoms have been calculated for each amino acid, the peptide backbone, and peptide termini in order to compile a roadmap of the relative thermodynamics which influence protein radical chemistry. With this information it is possible to gain insight into what contributions both kinetics and thermodynamics will make to various radical mediated reaction pathways.
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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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