Comparison of Spatial Structures and Packaging of Phosphorybosil Pyrophosphate Synthetase 2 from Thermus thermophilus HB27 in Rhombohedral and Tetragonal Crystals

Yulia Abramchik,Ilya Fateev,Inna Kuranova,Nadezda Zhukhlistova,Roman Esipov,Evgeniy Zayats,Dmitry Lykoshin,Irina Konstantinova,Maria Kostromina,Vladimir Timofeev

doi:10.3390/cryst11091128

Abstract

We report the spatial structure of phosphoribosyl pyrophosphate synthetase 2 from the thermophilic bacterium Thermus thermophilus HB27 (TthPRPPS2) obtained at a 1.85 Å resolution using a diffraction set collected from rhombohedral crystals (space group R32-h), grown with lithium sulfate as a precipitant. This crystal structure was compared with the structure of TthPRPPS2, previously obtained at a 2.2 Å resolution using diffraction sets from the tetragonal crystals (space group P41212), grown with ammonium sulfate as a precipitant. The comparison of these structures allows the study of the differences between protein molecules in both crystalline structures, as well as the packaging of enzyme molecules in crystals of both spatial groups. Our results may contribute to the research of the structural basis of catalytic activity and substrate specificity of this enzyme.

Highlights

Phosphoribosyl pyrophosphate synthetases (PRPPS) catalyze the synthesis of 5-phosphorybosyl-α-1-pyrophosphate (5PRPP), using ribose-5-phosphate (R5P) and ATP as substrates
We report the spatial structure of phosphoribosyl pyrophosphate synthetase 2 from the thermophilic bacterium Thermus thermophilus HB27 (TthPRPPS2) obtained at a 1.85 Å resolution using a diffraction set collected from rhombohedral crystals, grown with lithium sulfate as a precipitant
This crystal structure was compared with the structure of TthPRPPS2, previously obtained at a 2.2 Å resolution using diffraction sets from the tetragonal crystals, grown with ammonium sulfate as a precipitant

Summary

Introduction

Phosphoribosyl pyrophosphate synthetases (PRPPS) catalyze the synthesis of 5-phosphorybosyl-α-1-pyrophosphate (5PRPP), using ribose-5-phosphate (R5P) and ATP as substrates. Rhombohedral and tetragonal crystals of Tth2PRPPS HB27 differ in the number of subunits in the independent part of the unit cell.

Results

Conclusion