Substrate Specificity and Biochemical Characteristics of an Engineered Mammalian Chondroitinase ABC

0552860 - ÚEM 2022 RIV US eng J - Článek v odborném periodiku
Warren, P.M. - Fawcett, James - Kwok, Jessica
Substrate Specificity and Biochemical Characteristics of an Engineered Mammalian Chondroitinase ABC.
ACS Omega. Roč. 6, č. 17 (2021), s. 11223-11230. ISSN 2470-1343. E-ISSN 2470-1343
Grant CEP: GA MŠMT(CZ) EF15_003/0000419
Institucionální podpora: RVO:68378041
Klíčová slova: central-nervous-system * spinal-cord-injury * axon-growth * functional recovery
Obor OECD: Biochemistry and molecular biology
Impakt faktor: 4.132, rok: 2021
Způsob publikování: Open access
https://pubs.acs.org/doi/10.1021/acsomega.0c06262

Chondroitin sulfate proteoglycans inhibit regeneration, neuroprotection, and plasticity following spinal cord injury. The development of a second-generation chondroitinase ABC enzyme, capable of being secreted from mammalian cells (mChABC), has facilitated the functional recovery of animals following severe spinal trauma. The genetically modified enzyme has been shown to efficiently break down the inhibitory extracellular matrix surrounding cells at the site of injury, while facilitating cellular integration and axonal growth. However, the activity profile of the enzyme in relation to the original bacterial chondroitinase (bChABC) has not been determined. Here, we characterize the activity profile of mChABC and compare it to bChABC, both enzymes having been maintained under physiologically relevant conditions for the duration of the experiment. We show that this genetically modified enzyme can be secreted reliably and robustly in high yields from a mammalian cell line. The modifications made to the cDNA of the enzyme have not altered the functional activity of mChABC compared to bChABC, ensuring that it has optimal activity on chondroitin sulfate-A, with an optimal pH at 8.0 and temperature at 37 degrees C. However, mChABC shows superior thermostability compared to bChABC, ensuring that the recombinant enzyme operates with enhanced activity over a variety of physiologically relevant substrates and temperatures compared to the widely used bacterial alternative without substantially altering its kinetic output. The determination that mChABC can function with greater robustness under physiological conditions than bChABC is an important step in the further development of this auspicious treatment strategy toward a clinical application.
Trvalý link: http://hdl.handle.net/11104/0327956