Native MS dataset for: "Insights into the pathogenesis of primary hyperoxaluria type I from the structural dynamics of alanine:glyoxylate aminotransferase variants"

Native mass spectrometry dataset used in: Insights into the pathogenesis of primary hyperoxaluria type I from the structural dynamics of alanine:glyoxylate aminotransferase variants. Pavla Vankova, Juan Luis Pacheco-Garcia, Dmitry S. Loginov, Atanasio Gómez-Mulas, Alan Kádek, José Manuel Martín-Garcia, Eduardo Salido, Petr Man and Angel L. Pey. FEBS Letters (2024) Description: Native mass spectrometry (MS) analysis verifying the oligomeric state of alanine:glyoxylate aminotransferase (AGT) protein and its P11L and I340M (LM) polymorphism and LM G170R mutation variants in primary hyperoxaluria type I. Sample processing: AGT protein as well as its LM and LM G130R mutants were buffer exchanged into 150 mM aqueous ammonium acetate solution (pH 7.5, MS-grade, Sigma-Aldrich) through six cycles of tenfold dilution and re-concentration using centrifugal concentrators Vivaspin 500 (30 kDa cut-off, Sartorius). Desalted proteins were introduced into a Synapt G2Si mass spectrometer (Waters) via static nanoelectrospray ionization from in-house prepared gold-coated borosilicate glass capillaries Kwik-Fil 1B120F-4 (World Precision Instruments). Protein concentration in samples was determined by 280 nm absorbance measurements using DeNovix DS-11 spectrophotometer. Samples were diluted in ammonium acetate and electrosprayed at 1 and 2 µM concentration. The mass spectrometer was carefully tuned for best signal quality and intensity, while keeping ion activation and unfolding minimal. Namely, electrospray voltage was kept at 1.3 kV, source desolvation temperature 80°C, sampling cone 80 V and 10 V collision voltage with 6 ml/min flow of argon in the trap region for thermalization of ions. Quadrupole was operated in a broadband transmission mode up to 8000 m/z while the spectra were acquired in mass range 500 – 20000 m/z. Spectra were externally mass recalibrated using known masses of caesium iodide clusters. Data processing: Raw mass spectra were averaged over 75 scans and further processed in Waters MassLynx 4.1. The averaged spectra were exported for ZENODO deposition as plain in plain m/z vs intensity .txt files as well uploaded as part of the .raw file format of the whole analysis (including initial metadata) with scan descriptions and parameter changes described in a stand-alone .txt descriptor file.