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Abstract
Membrane proteins are core components of many essential cellular processes, and high-resolution structural data is therefore highly sought after. However, owing to the many bottlenecks associated with membrane protein crystallization, progress has been slow. One major problem is our inability to obtain sufficient quantities of membrane proteins for crystallization trials. Traditionally, membrane proteins have been isolated from natural sources, or for prokaryotic proteins, expressed by recombinant techniques. We are however a long way away from a streamlined overproduction of eukaryotic proteins. With this technical limitation in mind, we have probed the question as to how far prokaryotic homologues can take us towards a structural understanding of the eukaryotic/human membrane proteome(s).