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Catenane structures, in which two or more rings are mechanically interlocked, have historically occupied one of the central places in the field of supramolecular chemistry. In contrast to synthetic small-molecule catenanes, examples of naturally-occurring catenanes are scarce. Here, we report thermodynamic and enzymatic studies on CS2 hydrolase, which exists in solution as a mixture of unique hexadecameric catenane and octameric ring forms. A combination of field-flow fractionation coupled to multi-angle laser light scattering (FFF-MALLS) and native mass spectrometric analyses revealed that the catenane form is converted into the ring form at elevated temperatures, whereas the ring does not assemble into the catenane under the same conditions. Measurements of the enzyme kinetics for the conversion of CS2 into COS and H2S showed that the ring form of CS2 hydrolase possesses higher enzyme efficiency (per monomer) than the catenane form, whereas the catenane form is overall more active (per assembly). © 2014 the Partner Organisations.

Original publication

DOI

10.1039/c4sc00059e

Type

Journal article

Journal

Chemical Science

Publication Date

01/01/2014

Volume

5

Pages

2879 - 2884