Disaggregases, molecular chaperones that resolubilize protein aggregates

Anais da Academia Brasileira de Ciências

David Z. Mokry¹  Josielle Abrahão¹  Carlos H.i. Ramos¹ 

关键词: amyloid;    disaggregase;    shock protein;    molecular chaperones;    prion;    protein folding;    amilóide;    desagregase;    proteínas do choque térmico;    chaperonas moleculares;    príons;    enovelamento de proteínas;   

DOI  :  10.1590/0001-3765201520140671

来源: SciELO

【 摘 要 】

The process of folding is a seminal event in the life of a protein, as it is essential for proper protein function and therefore cell physiology. Inappropriate folding, or misfolding, can not only lead to loss of function, but also to the formation of protein aggregates, an insoluble association of polypeptides that harm cell physiology, either by themselves or in the process of formation. Several biological processes have evolved to prevent and eliminate the existence of non-functional and amyloidogenic aggregates, as they are associated with several human pathologies. Molecular chaperones and heat shock proteins are specialized in controlling the quality of the proteins in the cell, specifically by aiding proper folding, and dissolution and clearance of already formed protein aggregates. The latter is a function of disaggregases, mainly represented by the ClpB/Hsp104 subfamily of molecular chaperones, that are ubiquitous in all organisms but, surprisingly, have no orthologs in the cytosol of metazoan cells. This review aims to describe the characteristics of disaggregases and to discuss the function of yeast Hsp104, a disaggregase that is also involved in prion propagation and inheritance.

【 授权许可】

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