Open and Closed Structures of the UDP-glucose Pyrophosphorylase from Leishmania major
| Autor: | Gleb Bourenkov, Thomas Steiner, Stephan Krapp, Rita Gerardy-Schahn, Robert Huber, Petra Hess, Uwe Jacob, Anne-Christin Lamerz, Constanze Breithaupt |
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| Rok vydání: | 2007 |
| Předmět: |
Protein Folding
UTP-Glucose-1-Phosphate Uridylyltransferase Virulence Factors Glycoconjugate Protozoan Proteins Biology Crystallography X-Ray Biochemistry Catalysis Protein Structure Secondary chemistry.chemical_compound Apoenzymes Animals Transferase Leishmania major Molecular Biology chemistry.chemical_classification UTP—glucose-1-phosphate uridylyltransferase Mutagenesis Cell Biology Nucleotidyltransferase biology.organism_classification Uridine Protein Structure Tertiary Enzyme chemistry Glycoconjugates |
| Zdroj: | Journal of Biological Chemistry. 282:13003-13010 |
| ISSN: | 0021-9258 |
| Popis: | Uridine diphosphate-glucose pyrophosphorylase (UGPase) represents a ubiquitous enzyme, which catalyzes the formation of UDP-glucose, a key metabolite of the carbohydrate pathways of all organisms. In the protozoan parasite Leishmania major, which causes a broad spectrum of diseases and is transmitted to humans by sand fly vectors, UGPase represents a virulence factor because of its requirement for the synthesis of cell surface glycoconjugates. Here we present the crystal structures of the L. major UGPase in its uncomplexed apo form (open conformation) and in complex with UDP-glucose (closed conformation). The UGPase consists of three distinct domains. The N-terminal domain exhibits species-specific differences in length, which might permit distinct regulation mechanisms. The central catalytic domain resembles a Rossmann-fold and contains key residues that are conserved in many nucleotidyltransferases. The C-terminal domain forms a left-handed parallel beta-helix (LbetaH), which represents a rarely observed structural element. The presented structures together with mutagenesis analyses provide a basis for a detailed analysis of the catalytic mechanism and for the design of species-specific UGPase inhibitors. |
| Databáze: | OpenAIRE |
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