Download MendeleyStructural and functional insights into the human Upf1 helicase core
Cheng, Z., Muhlrad, D., Lim, M.K., Parker, R., Song, H.(2007) EMBO J 26: 253-264
- PubMed: 17159905
- DOI: https://doi.org/10.1038/sj.emboj.7601464
- Primary Citation of Related Structures:
2GJK, 2GK6, 2GK7 - PubMed Abstract:
Nonsense-mediated mRNA decay (NMD) is an mRNA surveillance pathway that recognizes and degrades aberrant mRNAs containing premature stop codons. A critical protein in NMD is Upf1p, which belongs to the helicase super family 1 (SF1), and is thought to utilize the energy of ATP hydrolysis to promote transitions in the structure of RNA or RNA-protein complexes. The crystal structure of the catalytic core of human Upf1p determined in three states (phosphate-, AMPPNP- and ADP-bound forms) reveals an overall structure containing two RecA-like domains with two additional domains protruding from the N-terminal RecA-like domain. Structural comparison combined with mutational analysis identifies a likely single-stranded RNA (ssRNA)-binding channel, and a cycle of conformational change coupled to ATP binding and hydrolysis. These conformational changes alter the likely ssRNA-binding channel in a manner that can explain how ATP binding destabilizes ssRNA binding to Upf1p.
Organizational Affiliation:
Laboratory of Macromolecular Structure, Institute of Molecular and Cell Biology, Singapore, Singapore.
