8HLZ

F8-A22-E4 complex of MPXV in hexameric form

Summary for 8HLZ

• Entry DOI: 10.2210/pdb8hlz/pdb
• EMDB information: 34886
• Descriptor: DNA polymerase processivity factor component A20, E4R, DNA polymerase (3 entities in total)
• Functional Keywords: mpxv, complex, recombination, replication
• Biological source: Monkeypox virus (monkeypox); More
• Total number of polymer chains: 6
• Total formula weight: 382917.54

Authors

Li, Y.N.,Shen, Y.P.,Hu, Z.W.,Yan, R.H. (deposition date: 2022-12-02, release date: 2023-05-31, Last modification date: 2023-12-13)

Primary citation

Li, Y.,Shen, Y.,Hu, Z.,Yan, R.
Structural basis for the assembly of the DNA polymerase holoenzyme from a monkeypox virus variant.
Sci Adv, 9:eadg2331-eadg2331, 2023

PubMed Abstract: The ongoing global pandemic caused by a variant of the monkeypox (or mpox) virus (MPXV) has prompted widespread concern. The MPXV DNA polymerase holoenzyme, consisting of F8, A22, and E4, is vital for replicating the viral genome and represents a crucial target for the development of antiviral drugs. However, the assembly and working mechanism for the DNA polymerase holoenzyme of MPXV remains elusive. Here, we present the cryo-electron microscopy (cryo-EM) structure of the DNA polymerase holoenzyme at an overall resolution of 3.5 Å. Unexpectedly, the holoenzyme is assembled as a dimer of heterotrimers, of which the extra interface between the thumb domain of F8 and A22 shows a clash between A22 and substrate DNA, suggesting an autoinhibition state. Addition of exogenous double-stranded DNA shifts the hexamer into trimer exposing DNA binding sites, potentially representing a more active state. Our findings provide crucial steps toward developing targeted antiviral therapies for MPXV and related viruses.

PubMed: 37075110
DOI: 10.1126/sciadv.adg2331

Experimental method

ELECTRON MICROSCOPY (3.5 Å)