Crystallization and Characterization of Galdieria sulphuraria RUBISCO in Two Crystal Forms: Structural Phase Transition Observed in P21 Crystal Form

Baranowski, Michael; Stec, Boguslaw

doi:10.3390/i8101039

Volume 8, Issue 10

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Int. J. Mol. Sci. 2007, 8(10), 1039-1051; https://doi.org/10.3390/i8101039

Crystallization and Characterization of Galdieria sulphuraria RUBISCO in Two Crystal Forms: Structural Phase Transition Observed in P21 Crystal Form

Michael Baranowski¹ and Boguslaw Stec^2,*

Department of Chemistry, University of Texas at El Paso, 500 W. University Ave. El Paso, TX 79968, USA

Burnham Institute for Medical Research, 10901 N. Torrey Pines Rd. La Jolla, CA 92037, USA

Author to whom correspondence should be addressed.

Received: 13 July 2007 / Revised: 15 October 2007 / Accepted: 16 October 2007 / Published: 23 October 2007

(This article belongs to the Special Issue Protein Crystallography)

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Abstract

We have isolated ribulose-1,5-bisphosphate-carboxylase/oxygenase (RUBISCO)from the red algae Galdieria Sulphuraria. The protein crystallized in two different crystalforms, the I422 crystal form being obtained from high salt and the P21 crystal form beingobtained from lower concentration of salt and PEG. We report here the crystallization,preliminary stages of structure determination and the detection of the structural phasetransition in the P21 crystal form of G. sulphuraria RUBISCO. This red algae enzymebelongs to the hexadecameric class (L8S8) with an approximate molecular weight 0.6MDa.The phase transition in G. sulphuraria RUBISCO leads from two hexadecamers to a singlehexadecamer per asymmetric unit. The preservation of diffraction power in a phasetransition for such a large macromolecule is rare. View Full-Text

Keywords: RUBISCO; red algae; crystallization; phase transition.

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Baranowski, M.; Stec, B. Crystallization and Characterization of Galdieria sulphuraria RUBISCO in Two Crystal Forms: Structural Phase Transition Observed in P21 Crystal Form. Int. J. Mol. Sci. 2007, 8, 1039-1051.