Format

Send to

Choose Destination
Proc Natl Acad Sci U S A. 2010 Jun 8;107(23):10401-5. doi: 10.1073/pnas.1005492107. Epub 2010 May 24.

DNA polymerase eta lacking the ubiquitin-binding domain promotes replicative lesion bypass in humans cells.

Author information

1
Department of Biochemistry and Molecular Biology, University of Texas Medical Branch at Galveston, 301 University Boulevard, Galveston, TX 77555-1061, USA.

Abstract

The Rad6-Rad18 mediated monoubiquitylation of proliferating cell nuclear antigen (PCNA) at lys 164 plays a crucial role in promoting the access of translesion synthesis (TLS) DNA polymerases (Pols) to PCNA in the replication fork stalled at a lesion site. Although a number of genetic and biochemical observations have provided strong evidence that TLS Pols bind PCNA at its interdomain connector loop (IDCL) via their PCNA-interacting protein (PIP) domain, a more recent proposal formulates that TLS Pols bind PCNA at two sites, to the IDCL via their PIP domain and to lys-164 linked ubiquitin (Ub) via their ubiquitin-binding domain. To ascertain the relative contributions of the PIP and Ub-binding zinc finger (UBZ) domains of human Poleta in TLS, we have determined whether the C-terminal truncations of hPoleta that contain the PIP1 domain but lack the UBZ and PIP2 domains can still function in TLS in human cells. Our observations that such C-terminally truncated proteins promote efficient TLS opposite a cis-syn TT dimer and confer a high degree of UV resistance to XPV cells provide unambiguous evidence that the binding of PCNA via its PIP domain is essential as well as sufficient for providing hPoleta the ability to carry out TLS in human cells.

PMID:
20498091
PMCID:
PMC2890850
DOI:
10.1073/pnas.1005492107
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for HighWire Icon for PubMed Central
Loading ...
Support Center