Sugiyama T, Nobuta R, Ando K, Matsuki Y, Inada T. Crucial role of ATP-bound Sse1 in Upf1-dependent degradation of the truncated product.
Biochem Biophys Res Commun 2017;
488:122-128. [PMID:
28483531 DOI:
10.1016/j.bbrc.2017.05.020]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Accepted: 05/03/2017] [Indexed: 02/01/2023]
Abstract
Up-frameshift (Upf) complex facilitates the degradation of aberrant mRNAs containing a premature termination codon (PTC) and its products in yeast. Here we report that Sse1, a member of the Hsp110 family, and Hsp70 play a crucial role in Upf-dependent degradation of the truncated FLAG-Pgk1-300 protein derived from PGK1 mRNA harboring a PTC at codon position 300. Sse1 was required for Upf-dependent rapid degradation of the FLAG-Pgk1-300. FLAG-Pgk1-300 was significantly destabilized in ATP hydrolysis defective sse1-1 mutant cells than in wild type cells. Consistently, Sse1 and Hsp70 reduced the level of an insoluble form of FLAG-Pgk1-300. We propose that the Sse1/Hsp70 complex maintains the solubility of FLAG-Pgk1-300, thereby stimulating its Upf-dependent degradation by the proteasomes.
Collapse