FTIR spectroscopy and sequence prediction: Structure of human α2-macroglobulin

Computer Science

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Infrared And Raman Spectroscopy

Scientific paper

The structure of a plasma proteinase inhibitor α2-Macroglobulin (α2m) is determined by FTIR spectroscopy and a number of sequence-structure prediction algorithms. In addition, α2M dimers and complexes with methylamine and trypsin are examined. Our FTIR results estimate a helix content of 5-15% and a β-sheet content of 28-36%. None of the sequence prediction algorithms used in this study predicted values close to experimental data. Considerable differences in the FTIR spectra of α2M dimer are observed and somewhat smaller changes are seen upon reaction of α2M with methylamine and dithiodipyridine (DTP).

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