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Systematic analysis of the PTEN 5' leader identifies a major AUU initiated proteoform
Tzani, Ioanna; Ivanov, Ivaylo P.; Andreev, Dmitri E.; Dmitriev, Ruslan I.; Dean, Kellie A.; Baranov, Pavel V.; Atkins, John F.; Loughran, Gary
Abundant evidence for translation within the 5′ leaders of many human genes is rapidly emerging, especially, because of the advent of ribosome profiling. In most cases, it is believed that the act of translation rather than the encoded peptide is important. However, the wealth of available sequencing data in recent years allows phylogenetic detection of sequences within 5′ leaders that have emerged under coding constraint and therefore allow for the prediction of functional 5′ leader translation. Using this approach, we previously predicted a CUG-initiated, 173 amino acid N-terminal extension to the human tumour suppressor PTEN. Here, a systematic experimental analysis of translation events in the PTEN 5′ leader identifies at least two additional non-AUG-initiated PTEN proteoforms that are expressed in most human cell lines tested. The most abundant extended PTEN proteoform initiates at a conserved AUU codon and extends the canonical AUG-initiated PTEN by 146 amino acids. All N-terminally extended PTEN proteoforms tested retain the ability to downregulate the PI3K pathway. We also provide evidence for the translation of two conserved AUG-initiated upstream open reading frames within the PTEN 5′ leader that control the ratio of PTEN proteoforms.
Keyword(s): PTEN-L; non-AUG; AUU; uORF; Molecular biology
Publication Date:
2016
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Institution: University College Cork
Funder(s): Science Foundation Ireland; Health Research Board
Citation(s): Tzani, I., Ivanov, I. P., Andreev, D. E., Dmitriev, R. I., Dean, K. A., Baranov, P. V., Atkins, J. F. and Loughran, G. (2016) 'Systematic analysis of the <em>PTEN</em> 5′ leader identifies a major AUU initiated proteoform', Open Biology, 6(5), 150203 (13pp). doi: 10.1098/rsob.150203
Publisher(s): The Royal Society
File Format(s): application/pdf
Related Link(s): http://rsob.royalsocietypublishing.org/content/royopenbio/6/5/150203.full.pdf
First Indexed: 2018-03-29 06:30:10 Last Updated: 2018-03-29 06:30:10