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Title | Dynamics of the Herpes simplex virus DNA polymerase holoenzyme during DNA synthesis and proof-reading revealed by Cryo-EM. |
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Journal, issue, pages | Nucleic Acids Res, Vol. 52, Issue 12, Page 7292-7304, Year 2024 |
Publish date | Jul 8, 2024 |
Authors | Emil Gustavsson / Kay Grünewald / Per Elias / B Martin Hällberg / |
PubMed Abstract | Herpes simplex virus 1 (HSV-1), a double-stranded DNA virus, replicates using seven essential proteins encoded by its genome. Among these, the UL30 DNA polymerase, complexed with the UL42 ...Herpes simplex virus 1 (HSV-1), a double-stranded DNA virus, replicates using seven essential proteins encoded by its genome. Among these, the UL30 DNA polymerase, complexed with the UL42 processivity factor, orchestrates leading and lagging strand replication of the 152 kb viral genome. UL30 polymerase is a prime target for antiviral therapy, and resistance to current drugs can arise in immunocompromised individuals. Using electron cryo-microscopy (cryo-EM), we unveil the dynamic changes of the UL30/UL42 complex with DNA in three distinct states. First, a pre-translocation state with an open fingers domain ready for nucleotide incorporation. Second, a halted elongation state where the fingers close, trapping dATP in the dNTP pocket. Third, a DNA-editing state involving significant conformational changes to allow DNA realignment for exonuclease activity. Additionally, the flexible UL30 C-terminal domain interacts with UL42, forming an extended positively charged surface binding to DNA, thereby enhancing processive synthesis. These findings highlight substantial structural shifts in the polymerase and its DNA interactions during replication, offering insights for future antiviral drug development. |
External links | Nucleic Acids Res / PubMed:38806233 / PubMed Central |
Methods | EM (single particle) |
Resolution | 1.87 - 3.11 Å |
Structure data | EMDB-16906, PDB-8oj6: EMDB-16907, PDB-8oj7: EMDB-16909, PDB-8oja: EMDB-16910, PDB-8ojb: EMDB-16911, PDB-8ojc: EMDB-16912, PDB-8ojd: EMDB-16918: Focused refinement map of HSV-1 DNA polymerase in pre-translocation state EMDB-16919: Focused refinement map of HSV-1 DNA polymerase processivity factor in pre-translocation state EMDB-16924: Focused refinement of HSV-1 DNA polymerase in halted elongation state EMDB-16925: Focused refinement of HSV-1 DNA polymerase processivity factor in halted elongation state EMDB-16927: Focused refinement map of HSV-1 DNA polymerase in exonuclease state EMDB-16928: Focused refinement map of HSV-1 DNA polymerase processivity factor in exonuclease state EMDB-17013: HSV-1 DNA polymerase-processivity factor complex in halted elongation state consensus map EMDB-17014: Consensus map of HSV-1 DNA polymerase-processivity factor complex in pre-translocation state EMDB-17018: Consensus map of HSV-1 DNA polymerase-processivity factor complex in exonuclease state EMDB-19837, PDB-9enp: EMDB-19838, PDB-9enq: EMDB-19839: HSV-1 DNA polymerase-processivity factor complex in exonuclease state with 1-bp DNA mismatch consensus map EMDB-19840: HSV-1 DNA polymerase-processivity factor complex in exonuclease state with 1-bp DNA mismatch catalytic core focused map EMDB-19841: HSV-1 DNA polymerase-processivity factor complex in exonuclease state with 1-bp DNA mismatch processivity factor focused refinement |
Chemicals | ChemComp-MG: ChemComp-HOH: ChemComp-DTP: ChemComp-CA: |
Source |
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Keywords | TRANSFERASE / DNA / Polymerase / Complex |