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Published online before print October 26, 2007, 10.1110/ps.073104707
Protein Science (2007), 16:2667-2676. Published by Cold Spring Harbor Laboratory Press. Copyright © 2007 The Protein Society
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Expression screening of integral membrane proteins from Helicobacter pylori 26695

Georgios Psakis1,3, Sandra Nitschkowski1,3, Caterina Holz2, Daniel Kreß1, Manuel Maestre-Reyna1, Julia Polaczek1, Gerd Illing2, and Lars-Oliver Essen1

1 Department of Chemistry, Philipps University, Marburg 35032, Germany
2 PSF Biotech AG, Heubnerweg 6, Berlin 14059, Germany

(RECEIVED July 3, 2007; FINAL REVISION September 14, 2007; ACCEPTED September 14, 2007)

The efficiency of Helicobacter pylori as a mucosal pathogen is caused by unique soluble and integral membrane proteins, which allow its survival at acidic pH and successful colonization of the gastric environment. With about one-fourth of the H. pylori's proteome comprising integral membrane proteins, the need for solution of their three-dimensional (3D) structures becomes persistent as it can potentially drive the generation of more effective drugs. This study presents a medium-throughput approach for cloning and expression screening of integral membrane proteins from H. pylori (26695) using Escherichia coli as the expression host. One-hundred sixteen H. pylori targets were cloned into two different vector systems and heterologously expressed in E. coli. Eighty-four percent of these proteins displayed medium to high expression. No clear-cut correlation was found between expression levels and number of putative transmembrane spans, predicted functionality, and molecular mass. Nonetheless, expression of transporters and hypothetical proteins ≤40 kDa with two to four transmembrane spans displayed generally high expression levels. To statistically strengthen the quality of the data from the medium-throughput approach, a comparison with data derived from robotic-based methodologies was conducted. Optimization of expression and solubilization conditions for selected targets was also performed. Seventeen targets have been purified and subjected to crystallization so far. Eighteen percent of these targets (2/17) produced crystals under specific sets of crystallization conditions.

Keywords: Helicobacter pylori ; heterologous expression; medium-throughput manual approach; integral membrane proteins


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