Mol Biochem Parasitol. 2010 Nov 2. [Epub ahead of print]
Regions of intrinsic disorder help identify a novel nuclear localization signal in Toxoplasma gondii histone acetyltransferase TgGCN5-B
Dixon SE, Bhatti MM, Uversky VN, Dunker AK, Sullivan WJ Jr.
Department of Pharmacology and Toxicology.
We have previously shown that protozoan parasites, such as Toxoplasma gondii, contain a high prevalence of intrinsically disordered regions in their predicted proteins. Here, we determine that both TgGCN5-family histone acetyltransferases (HATs) contain unusually high levels of intrinsic disorder. A previously identified basic-rich nuclear localization signal (NLS) in the N-terminus of TgGCN5-A is located within such a region of predicted disorder, but this NLS is not conserved in TgGCN5-B. We therefore analyzed the intrinsically disordered regions of TgGCN5-B for basic-rich sequences that could be indicative of a functional NLS, and this led to the identification of a novel NLS for TgGCN5-B, RPAENKKRGR. The functionality of the GCN5-B NLS was validated experimentally and has predictive value. These studies demonstrate that basic-rich sequences within regions predicted to be intrinsically disordered constitute criteria for a candidate NLS.
Copyright © 2010. Published by Elsevier B.V.
PMID: 21055425 [PubMed - as supplied by publisher]