5EFC

Structure of Influenza B Lee PB2 cap-binding domain bound to GTP

Summary for 5EFC

• Entry DOI: 10.2210/pdb5efc/pdb
• Related: 5EF9 5EFA
• Descriptor: Polymerase basic protein 2, GUANOSINE-5'-TRIPHOSPHATE (3 entities in total)
• Functional Keywords: cap-binding domain, protein binding
• Biological source: Influenza B virus
• Cellular location: Virion: Q9QLL6
• Total number of polymer chains: 1
• Total formula weight: 20964.71

Authors

Ma, X.,Shia, S. (deposition date: 2015-10-23, release date: 2015-11-18, Last modification date: 2024-03-06)

Primary citation

Xie, L.,Wartchow, C.,Shia, S.,Uehara, K.,Steffek, M.,Warne, R.,Sutton, J.,Muiru, G.T.,Leonard, V.H.,Bussiere, D.E.,Ma, X.
Molecular Basis of mRNA Cap Recognition by Influenza B Polymerase PB2 Subunit.
J.Biol.Chem., 291:363-370, 2016

PubMed Abstract: Influenza virus polymerase catalyzes the transcription of viral mRNAs by a process known as "cap-snatching," where the 5'-cap of cellular pre-mRNA is recognized by the PB2 subunit and cleaved 10-13 nucleotides downstream of the cap by the endonuclease PA subunit. Although this mechanism is common to both influenza A (FluA) and influenza B (FluB) viruses, FluB PB2 recognizes a wider range of cap structures including m(7)GpppGm-, m(7)GpppG-, and GpppG-RNA, whereas FluA PB2 utilizes methylated G-capped RNA specifically. Biophysical studies with isolated PB2 cap-binding domain (PB2(cap)) confirm that FluB PB2 has expanded mRNA cap recognition capability, although the affinities toward m(7)GTP are significantly reduced when compared with FluA PB2. The x-ray co-structures of the FluB PB2(cap) with bound cap analogs m(7)GTP and GTP reveal an inverted GTP binding mode that is distinct from the cognate m(7)GTP binding mode shared between FluA and FluB PB2. These results delineate the commonalities and differences in the cap-binding site between FluA and FluB PB2 and will aid structure-guided drug design efforts to identify dual inhibitors of both FluA and FluB PB2.

PubMed: 26559973
DOI: 10.1074/jbc.M115.693051

Experimental method

X-RAY DIFFRACTION (1.9 Å)