Abstract:
:African swine fever virus (ASFV) can cause highly lethal disease in pigs and is becoming a global threat. ASFV DNA Polymerase X (AsfvPolX) is the most distinctive DNA polymerase identified to date; it lacks two DNA-binding domains (the thumb domain and 8-KD domain) conserved in the homologous proteins. AsfvPolX catalyzes the gap-filling reaction during the DNA repair process of the ASFV virus genome; it is highly error prone and plays an important role during the strategic mutagenesis of the viral genome. The structural basis underlying the natural substrate binding and the most frequent dG:dGTP misincorporation of AsfvPolX remain poorly understood. Here, we report eight AsfvPolX complex structures; our structures demonstrate that AsfvPolX has one unique 5'-phosphate (5'-P) binding pocket, which can favor the productive catalytic complex assembly and enhance the dGTP misincorporation efficiency. In combination with mutagenesis and in vitro catalytic assays, our study also reveals the functional roles of the platform His115-Arg127 and the hydrophobic residues Val120 and Leu123 in dG:dGTP misincorporation and can provide information for rational drug design to help combat ASFV in the future.
journal_name
PLoS Bioljournal_title
PLoS biologyauthors
Chen Y,Zhang J,Liu H,Gao Y,Li X,Zheng L,Cui R,Yao Q,Rong L,Li J,Huang Z,Ma J,Gan Jdoi
10.1371/journal.pbio.1002599subject
Has Abstractpub_date
2017-02-28 00:00:00pages
e1002599issue
2eissn
1544-9173issn
1545-7885pii
PBIOLOGY-D-16-01160journal_volume
15pub_type
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