Abstract
The structure of a Nova protein K homology (KH) domain recognizing single-stranded RNA has been determined at 2.4 Å resolution. Mammalian Nova antigens (1 and 2) constitute an important family of regulators of RNA metabolism in neurons, first identified using sera from cancer patients with the autoimmune disorder paraneoplastic opsoclonus-myoclonus ataxia (POMA). The structure of the third KH domain (KH3) of Nova-2 bound to a stem loop RNA resembles a molecular vise, with 5'-Ura-Cyt-Ade-Cyt-3' pinioned between an invariant Gly-X-X-Gly motif and the variable loop. Tetranucleotide recognition is supported by an aliphatic α helix/β sheet RNA-binding platform, which mimics 5'-Ura-Gua-3' by making Watson-Crick-like hydrogen bonds with 5'-Cyt-Ade-3'. Sequence conservation suggests that fragile X mental retardation results from perturbation of RNA binding by the FMR1 protein.
Original language | English |
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Pages (from-to) | 323-332 |
Number of pages | 10 |
Journal | Cell |
Volume | 100 |
Issue number | 3 |
DOIs | |
Publication status | Published or Issued - 4 Feb 2000 |
Externally published | Yes |
ASJC Scopus subject areas
- General Biochemistry,Genetics and Molecular Biology