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Substrate Induced Movement of the Metal Cofactor between Active and Resting State.


ABSTRACT: Regulation of enzyme activity is vital for living organisms. In metalloenzymes, far-reaching rearrangements of the protein scaffold are generally required to tune the metal cofactor's properties by allosteric regulation. Here structural analysis of hydroxyketoacid aldolase from Sphingomonas wittichii RW1 (SwHKA) revealed a dynamic movement of the metal cofactor between two coordination spheres without protein scaffold rearrangements. In its resting state configuration (M2+ R ), the metal constitutes an integral part of the dimer interface within the overall hexameric assembly, but sterical constraints do not allow for substrate binding. Conversely, a second coordination sphere constitutes the catalytically active state (M2+ A ) at 2.4 Å distance. Bidentate coordination of a ketoacid substrate to M2+ A affords the overall lowest energy complex, which drives the transition from M2+ R to M2+ A . While not described earlier, this type of regulation may be widespread and largely overlooked due to low occupancy of some of its states in protein crystal structures.

SUBMITTER: Marsden SR 

PROVIDER: S-EPMC10099721 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature

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Substrate Induced Movement of the Metal Cofactor between Active and Resting State.

Marsden Stefan R SR   Wijma Hein J HJ   Mohr Michael K F MKF   Justo Inês I   Hagedoorn Peter-Leon PL   Laustsen Jesper J   Jeffries Cy M CM   Svergun Dmitri D   Mestrom Luuk L   McMillan Duncan G G DGG   Bento Isabel I   Hanefeld Ulf U  

Angewandte Chemie (International ed. in English) 20221109 49


Regulation of enzyme activity is vital for living organisms. In metalloenzymes, far-reaching rearrangements of the protein scaffold are generally required to tune the metal cofactor's properties by allosteric regulation. Here structural analysis of hydroxyketoacid aldolase from Sphingomonas wittichii RW1 (SwHKA) revealed a dynamic movement of the metal cofactor between two coordination spheres without protein scaffold rearrangements. In its resting state configuration (M<sup>2+</sup> <sub>R</sub  ...[more]

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