Artículos de revistas
Small Angle X-ray Scattering From Lipid-bound Myelin Basic Protein In Solution
Registro en:
Biophysical Journal. , v. 86, n. 1 I, p. 455 - 460, 2004.
63495
2-s2.0-0347316424
Autor
Haas H.
Oliveira C.L.P.
Torriani I.L.
Polverini E.
Fasano A.
Carlone G.
Cavatorta P.
Riccio P.
Institución
Resumen
The structure of myelin basic protein (MBP), purified from the myelin sheath in both lipid-free (LF-MBP) and lipid-bound (LB-MBP) forms, was investigated in solution by small angle x-ray scattering. The water-soluble LF-MBP, extracted at pH < 3.0 from defatted brain, is the classical preparation of MBP, commonly regarded as an intrinsically unfolded protein. LB-MBP is a lipoprotein-detergent complex extracted from myelin with its native lipidic environment at pH > 7.0. Under all conditions, the scattering from the two protein forms was different, indicating different molecular shapes. For the LB-MBP, well-defined scattering curves were obtained, suggesting that the protein had a unique, compact (but not globular) structure. Furthermore, these data were compatible with earlier results from molecular modeling calculations on the MBP structure which have been refined by us. In contrast, the LF-MBP data were in accordance with the expected open-coil conformation. 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