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Conformational changes in the progesterone binding globulin-progesterone complex.

S D Stroupe, U Westphal

    Biochemistry
    |July 29, 1975
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    Researchers developed a new method to purify progesterone-binding globulin (PBG) from pregnant guinea pigs. This improved purification process yields a highly pure protein that changes conformation when binding to a steroid ligand.

    Area of Science:

    • Biochemistry
    • Protein Chemistry
    • Molecular Biology

    Background:

    • Progesterone-binding globulin (PBG) is a key glycoprotein in pregnant guinea pigs.
    • Previous purification methods for PBG were suboptimal.
    • Understanding PBG's structure and function is crucial for reproductive biology.

    Purpose of the Study:

    • To develop an improved and efficient purification procedure for progesterone-binding globulin (PBG).
    • To characterize the purified PBG and investigate its conformational changes upon ligand binding.

    Main Methods:

    • Utilized sulfopropyl Sephadex (strong cation exchanger) as the initial purification step.
    • Employed subsequent chromatography on DEAE-cellulose and Sephadex G-200.
    • Analyzed protein conformation using circular dichroism (CD), optical rotatory dispersion (ORD), and difference UV spectroscopy.

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    Main Results:

    • Achieved a highly purified PBG exhibiting previously noted polydispersity.
    • Demonstrated that purified PBG undergoes a conformational transition upon forming a complex with a steroid ligand.
    • Difference UV spectra indicated significant perturbation of tryptophan residues and the steroid chromophore in the PBG-steroid complex.

    Conclusions:

    • The developed purification method is effective for obtaining highly pure PBG.
    • PBG exhibits ligand-induced conformational changes, suggesting a dynamic role in steroid binding.
    • Further structural analysis is needed, considering potential carbohydrate contributions to CD and ORD spectra.