The evolutionarily conserved Tre2/Bub2/Cdc16 (TBC), Lysin motif (LysM), Domain catalytic (TLDc) domain is neuroprotective against oxidative stress.

The evolutionarily conserved Tre2/Bub2/Cdc16 (TBC), Lysin motif (LysM), Domain catalytic (TLDc) domain is neuroprotective against oxidative stress.

J Biol Chem. 2015 Dec 14;

Authors: Finelli MJ, Sanchez-Pulido L, Liu KX, Davies KE, Oliver PL

Abstract
Oxidative stress is a pathological feature of many neurological disorders, therefore utilizing proteins that are protective against such cellular insults is a potentially valuable therapeutic approach. Oxidation resistance 1 (OXR1) has been shown previously to be critical for oxidative stress resistance in neuronal cells; deletion of this gene causes neurodegeneration in mice, yet conversely, over-expression of OXR1 is protective in cellular and mouse models of amyotrophic lateral sclerosis (ALS). However, the molecular mechanisms involved are unclear. OXR1 contains the Tre2/Bub2/Cdc16 (TBC), Lysin motif (LysM), Domain catalytic (TLDC) domain, a motif present in a family of proteins including TBC1 domain family member 24 (TBC1D24), a protein mutated in a range of disorders characterized by seizures, hearing loss and neurodegeneration. The TLDc domain is highly conserved across species, although the structure-function relationship is unknown. To understand the role of this domain in the stress response, we carried out systematic analysis of all mammalian TLDc domain-containing proteins, investigating their expression and neuroprotective properties in parallel. In addition, we performed a detailed structural and functional study of this domain, in which we identified key residues required for its activity. Finally, we present a new mouse insertional mutant of Oxr1, confirming that specific disruption of the TLDc domain in vivo is sufficient to cause neurodegeneration. Our data demonstrate that the integrity of the TLDc domain is essential for conferring neuroprotection, an important step in understanding the functional significance of all TLDc domain-containing proteins in the cellular stress response and disease.

PMID: 26668325 [PubMed - as supplied by publisher]

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