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Secondary structure and shape of plasma sex steroid-binding protein - comparison with domain G of laminin results in a structural model of plasma sex steroid-binding protein

Beck, Konrad, Gruber, T. M., Ridgway, C. C., Hughes, W., Sui, L. and Pétra, P. H. 1997. Secondary structure and shape of plasma sex steroid-binding protein - comparison with domain G of laminin results in a structural model of plasma sex steroid-binding protein. European Journal of Biochemistry 247 (1) , pp. 339-347. 10.1111/j.1432-1033.1997.00339.x

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Abstract

We have analyzed the secondary structure, shape and dimensions of plasma sex steroid-binding protein (SBP) by CD, size-exclusion chromatography and electron microscopy. CD spectra show extrema at 186 nm and 216 nm characteristic for beta-sheet structures. Analysis with different algorithms indicates 15% alpha-helix, 43% beta-sheet and 10-16% beta-turn structures. An irreversible structural change is observed upon heating above 60 degrees C, which correlates with the loss of steroid-binding activity. As the SBP sequence shows similarity with domains of several multidomain proteins, including laminins, we evaluated the structure of domain G of laminin-1. The CD spectrum shows extrema at 200 nm and 216 nm. Deconvolution results in 13% alpha-helix, 32% beta-sheet and 15% beta-turn structures. Steroid-binding assays indicate that laminin and fragments thereof have no activity. Size-exclusion chromatography reveals that SBP has an extended shape and can be modeled as a cylinder with a length and diameter of 23 nm and 3 nm, respectively. This shape and the dimensions are in agreement with the appearance on electron micrographs. We propose a model for the structure of SBP in which two monomers assemble head to head with the steroid-binding site located in the center of the rod-like particle.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Dentistry
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: plasma sex-steroid-binding protein; sex-hormone-binding globulin; laminin; circular dichroism; hydrodynamics
Publisher: Wiley-Blackwell
ISSN: 0014-2956
Last Modified: 04 Jun 2017 03:04
URI: http://orca.cf.ac.uk/id/eprint/16314

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