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Title: Normal thermostability of p.Ser113Leu and p.Arg631Cys variants of mitochondrial Carnitine Palmitoyltransferase II (CPT II) in human muscle homogenate
Author(s): Joshi, Pushpa RajLook up in the Integrated Authority File of the German National Library
Stolberg-Stolberg, Maria
Scholle, LeilaLook up in the Integrated Authority File of the German National Library
Meinhardt, Beate
Pegoraro, Elena
Zierz, StephanLook up in the Integrated Authority File of the German National Library
Issue Date: 2022
Type: Article
Language: English
Abstract: Previous fibroblast and recombinant enzyme studies showed a markedly thermolabile p.Ser113Leu variant compared to the wild-type (WT) in muscle carnitine palmitoyltransferase II (CPT II) deficiency. Additionally, it has been shown that cardiolipin (CLP) stimulated or inhibited the p.Ser113Leu recombinant variant depending on the pre-incubation temperatures. In this study, the thermolabilities of mitochondrial enzyme CPT II in muscle homogenates of patients with the p.Ser113Leu (n = 3) and p.Arg631Cys (n = 2) variants were identified to be similar to that of WT. Pre-incubation with CLP on ice stimulated the WT enzyme more than both variants. However, CLP stimulated the variants and WT at 46 °C to about 6–18-fold. The present data indicate that the thermostability of CPT II variant in muscle homogenate is similar to that of WT. This is in contrast to the increased thermolability of enzymes derived from fibroblast and that of recombinant enzymes. Hence, it can be speculated that the disruption of the compartmentation in muscle homogenate mediates a protective effect on the thermolability of the native variant. However, the exact mechanism remains unclear. However, the activating effect of CLP on CPT II in muscle homogenate seems to align with those on recombinant enzymes.
Open Access: Open access publication
License: (CC BY 4.0) Creative Commons Attribution 4.0(CC BY 4.0) Creative Commons Attribution 4.0
Journal Title: Metabolites
Publisher: MDPI
Publisher Place: Basel
Volume: 12
Issue: 11
Original Publication: 10.3390/metabo12111141
Page Start: 1
Page End: 7
Appears in Collections:Open Access Publikationen der MLU

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