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The Fanconi anemia (FA) protein FANCF is an essential component of a nuclear core complex that protects the genome against chromosomal instability, but the specific function of FANCF is still poorly understood. Based upon the homology between human and Xenopus laevis FANCF, we carried out an extensive mutagenesis study to examine which domains are functionally important and to gain more insight into the function of FANCF. In contrast to previous suggestions, we show that FANCF does not have a ROM-like function. We found that the C terminus of FANCF interacts directly with FANCG and allows the assembly of other FA proteins into a stable complex. The N terminus appears to stabilize the interaction with FANCA and FANCG and is essential for the binding of the FANCC/FANCE subcomplex. We identified several important amino acids in this N-terminal region but, surprisingly, many amino acid changes failed to affect the function of the FANCF protein. Our data demonstrate that FANCF acts as a flexible adaptor protein that plays a key role in the proper assembly of the FA core complex.

Original publication

DOI

10.1074/jbc.M407034200

Type

Journal article

Journal

J Biol Chem

Publication Date

17/09/2004

Volume

279

Pages

39421 - 39430

Keywords

Amino Acid Sequence, Animals, Cell Nucleus, Fanconi Anemia Complementation Group F Protein, Humans, Molecular Sequence Data, Mutagenesis, Protein Binding, Protein Structure, Secondary, Protein Structure, Tertiary, RNA-Binding Proteins, Sequence Homology, Amino Acid, Structure-Activity Relationship, Xenopus