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J Proteome Res. 2015 Nov 6;14(11):4815-22. doi: 10.1021/acs.jproteome.5b00653. Epub 2015 Oct 26.

Pulsed Azidohomoalanine Labeling in Mammals (PALM) Detects Changes in Liver-Specific LKB1 Knockout Mice.

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Department of Chemical Physiology and Molecular and Cellular Molecular Biology, The Scripps Research Institute , 10550 North Torrey Pines Road, La Jolla, California 92037, United States.
Key Lab of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences , No. 6 Kexueyuan South Road, Beijing 100190, China.


Quantification of proteomes by mass spectrometry has proven to be useful to study human pathology recapitulated in cellular or animal models of disease. Enriching and quantifying newly synthesized proteins (NSPs) at set time points by mass spectrometry has the potential to identify important early regulatory or expression changes associated with disease states or perturbations. NSP can be enriched from proteomes by employing pulsed introduction of the noncanonical amino acid, azidohomoalanine (AHA). We demonstrate that pulsed introduction of AHA in the feed of mice can label and identify NSP from multiple tissues. Furthermore, we quantitate differences in new protein expression resulting from CRE-LOX initiated knockout of LKB1 in mouse livers. Overall, the PALM strategy allows for the first time in vivo labeling of mouse tissues to differentiate protein synthesis rates at discrete time points.


BONCAT; LKB1; azidohomoalanine; mass spectrometry; newly synthesized proteins; proteomics; quantitation

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