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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

FANCL replaces BRCA1 as the likely ubiquitin ligase responsible for FANCD2 monoubiquitination.

Monoubiquitination of FANCD2 is a key step in the DNA damage response pathway involving Fanconi anemia proteins and the breast cancer susceptibility gene products, BRCA1 and BRCA2. One critical unresolved issue is the identity of the ubiquitin ligase responsible for this reaction. Two proteins, BRCA1 and FANCL(PHF9), have been suggested to be this ligase. Here we found that FANCL, but not BRCA1, evolutionarily co-exists with FANCD2 in several species. Moreover, the proportion of FANCD2 in chromatin and nuclear matrix is drastically reduced in a cell line mutated in FANCL, but not in that mutated in BRCA1. This defective distribution of FANCD2 in the FANCL-mutant cell line is likely due to its defective monoubiquitination, because the monoubiquitinated FANCD2 preferentially associates with chromatin and nuclear matrix, whereas non-ubiquitinated FANCD2 largely resides in the soluble fraction. Our data support the notion that FANCL, but not BRCA1, is the likely ligase for FANCD2 monoubiquitination.[1]


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