Journal
CHEMBIOCHEM
Volume 22, Issue 8, Pages 1440-1447Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cbic.202000742
Keywords
alpha-synuclein; native chemical ligation; NMR spectroscopy; phosphorylation; semi-synthesis
Funding
- National Institutes of Health [NIH NS103873, NS079955, GM136686, AG019391, S10OD016320]
- National Science Foundation [NSF MRI-0820996]
- University of Pennsylvania
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This study explores the impact of post-translational modifications on alpha-synuclein and introduces a streamlined method to produce phosphorylated alpha S in large quantities. By co-expressing a kinase with a protein fragment in Escherichia coli and using methyl thioglycolate, the researchers achieved high yields of site-specifically phosphorylated protein through chemoenzymatic methods. This strategy is particularly suitable for producing N-15-labeled, phosphorylated protein for NMR studies.
Post-translational modifications (PTMs) can affect the normal function and pathology of alpha-synuclein (alpha S), an amyloid-fibril-forming protein linked to Parkinson's disease. Phosphorylation of alpha S Tyr39 has recently been found to display a dose-dependent effect on fibril formation kinetics and to alter the morphology of the fibrils. Existing methods to access site-specifically phosphorylated alpha S for biochemical studies include total or semi-synthesis by native chemical ligation (NCL) as well as chemoenzymatic methods to phosphorylate peptides, followed by NCL. Here, we investigated a streamlined method to produce large quantities of phosphorylated alpha S by co-expressing a kinase with a protein fragment in Escherichia coli. We also introduced the use of methyl thioglycolate (MTG) to enable one-pot NCL and desulfurization. We compare our optimized methods to previous reports and show that we can achieve the highest yields of site-specifically phosphorylated protein through chemoenzymatic methods using MTG, and that our strategy is uniquely well suited to producing N-15-labeled, phosphorylated protein for NMR studies.
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