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New DNA repair pathway
Date:11/9/2010

yme called ADAR1. In that editing, one of the chains of amino acids that make up NEIL1 changes from lysine to arginine, causing a slight, but noticeable, change in the structure of the protein.

Using a cell line derived from nerve cells, the team found no editing of NEIL1 RNA in resting cells. But when the cells were treated with interferon, which is produced during inflammation and to fight off viruses, the cells started making ADAR1 and editing NEIL1.

"The interferon-treated cells had two forms of the NEIL1 protein, one with lysine and one with arginine," Beal said.

NEIL1 can fix a number of different damaged DNA bases that form when normal DNA bases are attacked by oxygen radicals. Beal and David found that the two different forms of NEIL1 had different abilities to act upon the damaged DNA bases: the basic, lysine version had a broader range but lower activity, while the edited, arginine form had higher activity but was effective against a more limited range of targets. That might give the cell more flexibility in responding to DNA damage.

Beal and David believe that the whole system works something like this: Inflammation creates oxygen radicals, which damage DNA, which is repaired by NEIL1. Inflammation also generates interferon, which induces ADAR1, which then edits NEIL1 to produce the more active, specific form to cope with more severe types of DNA base damage.


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Contact: Andy Fell
ahfell@ucdavis.edu
530-752-4533
University of California - Davis
Source:Eurekalert

Page: 1 2

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