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Spontaneous conversion of aspartic acid (Asp) to isoaspartic acid (Asp) is a ubiquitous modification that influences the structure and function of proteins. This modification of Asp impacts the stability of biotherapeutics and has been linked to the development of neurodegenerative diseases. We explored the use of 193 nm ultraviolet photodissociation (UVPD) to distinguish Asp and Asp in the protonated and deprotonated peptides. The differences in the relative abundances of several fragment ions uniquely generated by UVPD were used to differentiate isomeric peptide standards containing Asp or Asp. These fragment ions result from the cleavage of bonds N-terminal to Asp/Asp residues in addition to the side-chain losses from Asp/Asp or the losses of COOH, CO, CO, or HO from -ions. Fragmentation of Asp-containing tryptic peptides using UVPD resulted in more enhanced / + 1/ - 1/ ions, while Asp-containing peptides yielded more enhanced - 18/ - 45/ - 46 ions. UVPD was also used to identify an isomerized peptide from a tryptic digest of a monoclonal antibody. Moreover, UVPD of a protonated nontryptic peptide resulted in more enhanced ions N- and C-terminal to Asp and differences in / ion ratios that were used to identify the Asp peptide.
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http://dx.doi.org/10.1021/acs.analchem.3c02025 | DOI Listing |
Chemistry
December 2024
"Indian Institute of Science Education and Research Kolkata", Chemical Sciences, Research Complex, 741246, Mohanpur, INDIA.
The recent surge in emerging viral infections warrants the design of broad-spectrum antivirals. We aim to develop a lead molecule that targets a common biochemical feature of many enveloped viruses, membrane fusion. To achieve the broad-spectrum ability, instead of targeting the fusion machinery, we plan to modulate the physicochemical properties of the host and viral membranes to block fusion.
View Article and Find Full Text PDFAnal Sci
December 2024
School of Bioscience and Biotechnology, Tokyo University of Technology, 1404-1 Katakura, Hachioji, Tokyo, 192-0982, Japan.
A biosensor for biochemical oxygen demand (BOD) was developed based on intracellular 5'-adenosine triphosphate (ATP) measurements in Saccharomyces cerevisiae. Intracellular ATP was measured using an engineered protein named ATeam, comprising a bacterial FF-ATP synthase ε subunit sandwiched between cyan fluorescent protein and mVenus, a modified yellow fluorescent protein. Because the binding of ATP to ATeam induces changes in the fluorescence spectra owing to Fӧrster resonance energy transfer, S.
View Article and Find Full Text PDFAnal Chem
December 2024
MOBILion Systems, Chadds Ford, Pennsylvania 19317, United States.
Rapid identification of asparagine (Asn) deamidation and isoaspartate (Asp) in proteins remains a challenging analytical task during the development of biological therapeutics. For this study, 46 therapeutically relevant peptides corresponding to 13 peptide families (13 unmodified peptides and 33 modified peptides) were obtained; modified peptides included Asn deamidation and isoAsp. The peptide families were characterized by three methods: reversed-phase ultrahigh performance liquid chromatography-mass spectrometry (RP-UHPLC-MS); flow injection analysis high-resolution ion mobility-mass spectrometry (FIA-HRIM-MS); and shortened gradient RP-UHPLC-HRIM-MS.
View Article and Find Full Text PDFACS Omega
December 2024
Key Laboratory for Enhanced Oil & Gas Recovery of the Ministry of Education, Northeast Petroleum University, Daqing 163318, Heilongjiang, China.
In alkali/surfactant/polymer (ASP) flooding systems, alkalis react with clay minerals such as Illite, montmorillonite, and kaolinite, leading to reservoir damage and impacting oil recovery rates. Therefore, studying the dissolution effects of strong alkalis on clay minerals is crucial for improving oil recovery. This study uses Illite as a representative clay mineral and employs the ReaxFF reactive force field and molecular dynamics simulations to model its dissolution in NaOH solution.
View Article and Find Full Text PDFNanoscale
December 2024
College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China.
A chiral agent, TPE-ASP, incorporating aspartic acid as the chiral source and tetraphenylene derivatives as chromophores, was designed and synthesized. The chiral agent was self-assembled into regular spherical nanoparticles with a maximum luminescence asymmetry factor of |2.41 × 10| at 460 nm which is attributed to TPE-ASP.
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