4E5E

Crystal structure of avian influenza virus PAn Apo

Summary for 4E5E

• Entry DOI: 10.2210/pdb4e5e/pdb
• Related: 4E5F 4E5G 4E5H 4E5I 4E5J 4E5L
• Descriptor: Polymerase protein PA, SULFATE ION, MANGANESE (II) ION, ... (4 entities in total)
• Functional Keywords: endonuclease domain, h5n1 subtype, viral protein, transcription
• Biological source: Influenza A virus; More
• Cellular location: Host cytoplasm . Host nucleus : Q5EP34
• Total number of polymer chains: 4
• Total formula weight: 88871.84

Authors

DuBois, R.M.,White, S.W. (deposition date: 2012-03-14, release date: 2012-08-08, Last modification date: 2023-09-13)

Primary citation

Dubois, R.M.,Slavish, P.J.,Baughman, B.M.,Yun, M.K.,Bao, J.,Webby, R.J.,Webb, T.R.,White, S.W.
Structural and Biochemical Basis for Development of Influenza Virus Inhibitors Targeting the PA Endonuclease.
Plos Pathog., 8:e1002830-e1002830, 2012

PubMed Abstract: Emerging influenza viruses are a serious threat to human health because of their pandemic potential. A promising target for the development of novel anti-influenza therapeutics is the PA protein, whose endonuclease activity is essential for viral replication. Translation of viral mRNAs by the host ribosome requires mRNA capping for recognition and binding, and the necessary mRNA caps are cleaved or "snatched" from host pre-mRNAs by the PA endonuclease. The structure-based development of inhibitors that target PA endonuclease is now possible with the recent crystal structure of the PA catalytic domain. In this study, we sought to understand the molecular mechanism of inhibition by several compounds that are known or predicted to block endonuclease-dependent polymerase activity. Using an in vitro endonuclease activity assay, we show that these compounds block the enzymatic activity of the isolated PA endonuclease domain. Using X-ray crystallography, we show how these inhibitors coordinate the two-metal endonuclease active site and engage the active site residues. Two structures also reveal an induced-fit mode of inhibitor binding. The structures allow a molecular understanding of the structure-activity relationship of several known influenza inhibitors and the mechanism of drug resistance by a PA mutation. Taken together, our data reveal new strategies for structure-based design and optimization of PA endonuclease inhibitors.

PubMed: 22876176
DOI: 10.1371/journal.ppat.1002830

Experimental method

X-RAY DIFFRACTION (2.048 Å)