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Co-chaperones DNAJA1 and DNAJB6 are critical for regulation of polyglutamine aggregation.

ABSTRACT: Huntington's disease (HD) is caused by CAG repeat expansion in the huntingtin gene. The expanded polyglutamine (polyQ) repeat of the encoded protein leads to protein misfolding and aggregation, resulting in increased neuronal cell death. DNAJ co-chaperones play a crucial role in transferring misfolded/unfolded proteins to HSP70 chaperones, which play an essential role for protein folding. Here, we investigated the effect of knock out (KO) of three individual DNAJ genes in HEK293 cells expressing polyglutamine74exon1 huntingtin (polyQ74htt). Flourescence microscopy analysis revealed that KO of DNAJB6 resulted in a 5-fold increase in polyQ74htt aggregation and that DNAJA1 KO resulted in a 4-fold decrease of polyQ74htt aggregation. KO of DNAJB1 did not change the propensity of polyQ74htt to aggregate in cells. These findings where confirmed both by fluorescence microscopy analysis and filter trap assay (FTA). DNAJB6 KO cells displayed an increased rate of cell death as assessed by trypan blue exclusion and propidium iodide (PI) uptake assays. These results demonstrate that the DNAJ proteins DNAJA1 and DNAJB6 can modulate polyQ aggregation in opposite manners, and thus that fine-tuning the cellular levels of DNAJ proteins is critical for suppression of polyQ aggregation and cell survival.

SUBMITTER: Rodriguez-Gonzalez C

PROVIDER: S-EPMC7235262 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature

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Co-chaperones DNAJA1 and DNAJB6 are critical for regulation of polyglutamine aggregation.

Rodríguez-González Claudio C Lin Shiying S Arkan Sertan S Hansen Christian C

Scientific reports 20200518 1

Huntington's disease (HD) is caused by CAG repeat expansion in the huntingtin gene. The expanded polyglutamine (polyQ) repeat of the encoded protein leads to protein misfolding and aggregation, resulting in increased neuronal cell death. DNAJ co-chaperones play a crucial role in transferring misfolded/unfolded proteins to HSP70 chaperones, which play an essential role for protein folding. Here, we investigated the effect of knock out (KO) of three individual DNAJ genes in HEK293 cells expressing ...[more]

PMID: 32424160

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Project description:Small heat shock proteins (sHSPs) are ATP-independent chaperones vital to cellular proteostasis, preventing protein aggregation events linked to various human diseases including cataract. The α-crystallins, αA-crystallin (αAc) and αB-crystallin (αBc), represent archetypal sHSPs that exhibit complex polydispersed oligomeric assemblies and rapid subunit exchange dynamics. Yet, our understanding of how this plasticity contributes to chaperone function remains poorly understood. This study investigates structural changes in αAc and αBc during client sequestration under varying degree of chaperone saturation. Using biochemical and biophysical analyses combined with single-particle electron microscopy (EM), we examined αAc and αBc in their apo-states and at various stages of client-induced co-aggregation, using lysozyme as a model client. Quantitative single-particle analysis unveiled a continuous spectrum of oligomeric states formed during the co-aggregation process, marked by significant client-triggered expansion and quasi-ordered elongation of the sHSP scaffold. These structural modifications culminated in an apparent amorphous collapse of chaperone-client complexes, resulting in the creation of co-aggregates capable of scattering visible light. Intriguingly, these co-aggregates maintain internal morphological features of highly elongated sHSP scaffolding with striking resemblance to polymeric α-crystallin species isolated from aged lens tissue. This mechanism appears consistent across both αAc and αBc, albeit with varying degrees of susceptibility to client-induced co-aggregation. Importantly, our findings suggest that client-induced co-aggregation follows a distinctive mechanistic and quasi-ordered trajectory, distinct from a purely amorphous process. These insights reshape our understanding of the physiological and pathophysiological co-aggregation processes of sHSPs, carrying potential implications for a pathway toward cataract formation.

Dataset Information

Co-chaperones DNAJA1 and DNAJB6 are critical for regulation of polyglutamine aggregation.

Publications

Co-chaperones DNAJA1 and DNAJB6 are critical for regulation of polyglutamine aggregation.

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