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The 1.4 Å resolution structure of Paracoccus pantotrophus pseudoazurin
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Resumo(s)
Pseudoazurins are small type 1 copper proteins that are involved in the flow of electrons between various electron donors and acceptors in the bacterial periplasm, mostly under denitrifying conditions. The previously determined structure of Paracoccus pantotrophus pseudoazurin in the oxidized form was improved to a nominal resolution of 1.4 Å, with R and R free values of 0.188 and 0.206, respectively. This high-resolution structure makes it possible to analyze the interactions between the monomers and the solvent structure in detail. Analysis of the high-resolution structure revealed the structural regions that are responsible for monomer-monomer recognition during dimer formation and for protein-protein interaction and that are important for partner recognition. The pseudoazurin structure was compared with other structures of various type 1 copper proteins and these were grouped into families according to similarities in their secondary structure; this may be useful in the annotation of copper proteins in newly sequenced genomes and in the identification of novel copper proteins.
Descrição
info:eu-repo/grantAgreement/FCT/POCI-2010/SFRH%2FBPD%2F20357%2F2004/PT
This work was supported in part by Fundação para a Ciência e a Tecnologia (Lisbon, Portugal) through project grant POCTI/QUI/64638/2006. The authors would like to thank Dr Cecilia Bonifacio for help with crystallization and Dr Jose Trincao for help with data collection.
Palavras-chave
Copper proteins Electron transfer Paracoccus pantotrophus Pseudoazurin Type 1 blue copper protein family Biophysics Structural Biology Biochemistry Genetics Condensed Matter Physics