Phosphorylation of Fanconi anemia protein, FANCA, is regulated by Akt kinase.
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| Abstract |
Phosphorylation of the Fanconi anemia complementation group A (FANCA) protein is thought to be important for the function of the FA pathway. However, the kinase for FANCA (so-called FANCA-PK) remains to be identified. FANCA has a consensus sequence for Akt kinase near serine 1149 (Ser1149), suggesting that Akt can phosphorylate FANCA. We performed in vitro kinase assays using as substrate either a GST-fusion wild-type (WT) FANCA fragment or a GST-fusion FANCA fragment containing a mutation from serine to alanine at 1149 (FANCA-S1149A). These experiments confirmed that FANCA is phosphorylated at Ser 1149, in vitro. However, (32)P-orthophosphate labeling experiments revealed that FANCA-S1149A was more efficiently phosphorylated than WT-FANCA. Furthermore, phosphorylation of wild-type FANCA was blocked by coexpression of a constitutively active (CA)-Akt and enhanced by a dominant-negative (DN) Akt. Our results suggest that Akt is a negative regulator of FANCA phosphorylation.
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| Authors | Tetsuya Otsuki, Takahiro Nagashima, Norio Komatsu, Keita Kirito, Yusuke Furukawa, Shin-ichi Kobayashi Si, Johnson M Liu, Keiya Ozawa |
| Journal | Biochemical and biophysical research communications (Biochem Biophys Res Commun) Vol. 291 Issue 3 Pg. 628-34 (Mar 01 2002) ISSN: 0006-291X [Print] United States |
| PMID | 11855836 (Publication Type: Journal Article) |
| Copyright | ©2002 Elsevier Science (USA). |
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