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Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Proc+Natl+Acad+Sci+U+S+A 2017 ; 114 (10): 2479-84 Nephropedia Template TP
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Trimethylamine N-oxide stabilizes proteins via a distinct mechanism compared with betaine and glycine #MMPMID28228526
Liao YT; Manson AC; DeLyser MR; Noid WG; Cremer PS
Proc Natl Acad Sci U S A 2017[Mar]; 114 (10): 2479-84 PMID28228526show ga
Although trimethylamine N-oxide (TMAO) is perhaps the quintessential protein-stabilizing osmolyte, its mechanism of action has long remained elusive. Our study indicates that, in contrast to betaine and glycine, TMAO forms direct attractive interactions with polypeptides. This work strengthens and extends Berne?s previous conclusions, because we report results for a model polypeptide rather than a hydrophobic polymer. Our results are particularly striking, because we consider a model polypeptide that is enriched in amide groups that are believed responsible for the depletion of TMAO from unfolded proteins. Our study leads to the surprising conclusion that TMAO stabilizes folded conformations, despite interacting with unfolded conformations. We hypothesize that TMAO acts as a unique surfactant for the heterogeneous surface that emerges on protein folding.