Multiple oligomeric structures of a bacterial small heat shock protein

作者：Mani Nandini; Bhandari Spraha; Moreno Rodolfo; Hu Liya; Prasad B V Venkataram; Suguna Kaza

来源：Scientific Reports, 2016, 6(1): 24019.

DOI：10.1038/srep24019

Small heat shock proteins are ubiquitous molecular chaperones that form the first line of defence against the detrimental effects of cellular stress. Under conditions of stress they undergo drastic conformational rearrangements in order to bind to misfolded substrate proteins and prevent cellular protein aggregation. Owing to the dynamic nature of small heat shock protein oligomers, elucidating the structural basis of chaperone action and oligomerization still remains a challenge. In order to understand the organization of sHSP oligomers, we have determined crystal structures of a small heat shock protein from Salmonella typhimurium in a dimeric form and two higher oligomeric forms: an 18-mer and a 24-mer. Though the core dimer structure is conserved in all the forms, structural heterogeneity arises due to variation in the terminal regions.

• 出版日期2016-4-7