Self-assembly of short de novo designed peptides gives rise to catalytic amyloids capable of facilitating multiple chemical transformations. We show that catalytic amyloids can efficiently hydrolyze ...paraoxon, which is a widely used, highly toxic organophosphate pesticide. Moreover, these robust and inexpensive metal-containing materials can be easily deposited on various surfaces, producing catalytic flow devices. Finally, functional promiscuity of catalytic amyloids promotes tandem hydrolysis/oxidation reactions. High efficiency discovered in a very small library of peptides suggests an enormous potential for further improvement of catalytic properties, both in terms of catalytic efficiency and substrate scope.
Enzymes fold into unique three-dimensional structures, which underlie their remarkable catalytic properties. The requirement to adopt a stable, folded conformation is likely to contribute to their ...relatively large size (>10,000 Da). However, much shorter peptides can achieve well-defined conformations through the formation of amyloid fibrils. To test whether short amyloid-forming peptides might in fact be capable of enzyme-like catalysis, we designed a series of seven-residue peptides that act as Zn(2+)-dependent esterases. Zn(2+) helps stabilize the fibril formation, while also acting as a cofactor to catalyse acyl ester hydrolysis. These results indicate that prion-like fibrils are able to not only catalyse their own formation, but they can also catalyse chemical reactions. Thus, they might have served as intermediates in the evolution of modern-day enzymes. These results also have implications for the design of self-assembling nanostructured catalysts including ones containing a variety of biological and non-biological metal ions.
Aggregation of proteins into amyloids has long been recognized as one of the major contributors to disease and aging. Amyloids are known to catalyze their own formation but they have been considered ...the rock-bottom thermodynamic minimum of the protein fold without much functionality. We have recently demonstrated that aggregation of short peptides in the presence of metal ions gives rise to efficient catalytic activity. Here we present a detailed protocol for the synthesis and purification of these peptides and the preparation of amyloid-like fibrils. Then we describe an easy-to-perform, high-throughput assay to measure their hydrolytic activity.
Interactions between multiple functional groups are key to catalysis. Previously, we reported synergistic interactions in catalytic amyloids formed by mixtures of heptameric peptides that lead to ...significant improvements in esterase activity. Herein, we describe the in‐depth investigation of synergistic interactions within a family of amyloid fibrils, exploring the results of functional group interactions, the effects of chirality and the use of mixed enantiomers within fibrils. Remarkably, we find that synergistic interactions (either positive or negative) are found in the vast majority of binary mixtures of catalytic amyloid‐forming peptides. The productive arrangements of functionalities rapidly identified by mixing different peptides will undoubtedly lead to the development of more active catalysts for a variety of different transformations.
How to cook primordial soup? Synergistic interactions are prevalent in catalytic amyloids providing insight into how early prebiotic peptides might have found productive combinations of functional groups to become the precursors of modern‐day enzymes.
Just like a limited set of playing cards can provide many combinations, mixtures of peptides with different amino acids can form various functional materials. Even simple binary mixtures of ...heptapeptides can synergistically form catalytic amyloids with high (using arginine and glutamine), moderate (using lysine and glutamate), or low (using histidine and tyrosine) hydrolytic activities. More information can be found in the communication by I. V. Korendovych et al.
Bidirectional synthesis of montamine analogs Freitas, Melanie B.; Simollardes, Kelly A.; Rufo, Caroline M. ...
Tetrahedron letters,
10/2013, Letnik:
54, Številka:
40
Journal Article
Recenzirano
Odprti dostop
Reported herein is a bidirectional synthesis of symmetric N,N′-diacyl hydrazide compounds closely resembling the alkaloid natural product montamine. In the process, di-tert-butyl ...hydrazine-1,2-dicarboxylate was smoothly dialkylated with alkyl halides, then Boc deprotected and acylated with an acetate-protected acid chloride derived from ferulic acid. After acetate removal, simple montamine analogs were obtained in excellent overall yields. Fischer indole synthesis with 4-methoxyphenylhydrazine hydrochloride and dihydrofuran provided 5-methoxytryptophol, which was then elaborated to the 1,2-bis(5-methoxyindol-3-yl)hydrazide structure bearing the substitution pattern found in montamine.
PDF
