Structural highlights
Function
TRM1_HHV11 Component of the molecular motor that translocates viral genomic DNA in empty capsid during DNA packaging. Forms a tripartite terminase complex together with TRM2 and TRM3 in the host cytoplasm. Once the complex reaches the host nucleus, it interacts with the capsid portal vertex. This portal forms a ring in which genomic DNA is translocated into the capsid. TRM1 carries an endonuclease activity that plays an important role for the cleavage of concatemeric viral DNA into unit length genomes.[HAMAP-Rule:MF_04014][1] [2]
Publication Abstract from PubMed
Genome packaging is a fundamental process in a viral life cycle and a prime target of antiviral drugs. Herpesviruses use an ATP-driven packaging motor/terminase complex to translocate and cleave concatemeric dsDNA into procapsids but its molecular architecture and mechanism are unknown. We report atomic structures of a herpesvirus hexameric terminase complex in both the apo and ADP*BeF3-bound states. Each subunit of the hexameric ring comprises three components-the ATPase/terminase pUL15 and two regulator/fixer proteins, pUL28 and pUL33-unlike bacteriophage terminases. Distal to the nuclease domains, six ATPase domains form a central channel with conserved basic-patches conducive to DNA binding and trans-acting arginine fingers are essential to ATP hydrolysis and sequential DNA translocation. Rearrangement of the nuclease domains mediated by regulatory domains converts DNA translocation mode to cleavage mode. Our structures favor a sequential revolution model for DNA translocation and suggest mechanisms for concerted domain rearrangements leading to DNA cleavage.
Architecture of the herpesvirus genome-packaging complex and implications for DNA translocation.,Yang Y, Yang P, Wang N, Chen Z, Su D, Zhou ZH, Rao Z, Wang X Protein Cell. 2020 May;11(5):339-351. doi: 10.1007/s13238-020-00710-0. Epub 2020 , Apr 23. PMID:32328903[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Wills E, Scholtes L, Baines JD. Herpes simplex virus 1 DNA packaging proteins encoded by UL6, UL15, UL17, UL28, and UL33 are located on the external surface of the viral capsid. J Virol. 2006 Nov;80(21):10894-9. PMID:16920825 doi:10.1128/JVI.01364-06
- ↑ Taus NS, Baines JD. Herpes simplex virus 1 DNA cleavage/packaging: the UL28 gene encodes a minor component of B capsids. Virology. 1998 Dec 20;252(2):443-9. PMID:9878624 doi:10.1006/viro.1998.9475
- ↑ Yang Y, Yang P, Wang N, Chen Z, Su D, Zhou ZH, Rao Z, Wang X. Architecture of the herpesvirus genome-packaging complex and implications for DNA translocation. Protein Cell. 2020 May;11(5):339-351. PMID:32328903 doi:10.1007/s13238-020-00710-0
