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Aberrant self-assembly, induced by structural misfolding of the prion proteins, leads to a number of neurodegenerative disorders. In particular, misfolding of the mostly α-helical cellular prion protein (PrPC) into a β-sheet-rich disease-causing isoform (PrPSc) is the key molecular event in the formation of PrPSc aggregates. The molecular mechanisms underlying the PrPC-to-PrPSc conversion and subsequent...
The XPD helicase (Rad3 in Saccharomyces cerevisiae) is a component of transcription factor IIH (TFIIH), which functions in transcription initiation and Nucleotide Excision Repair in eukaryotes, catalyzing DNA duplex opening localized to the transcription start site or site of DNA damage, respectively. XPD has a 5′ to 3′ polarity and the helicase activity is dependent on an iron-sulfur cluster binding...
As part of a high-throughput structural analysis of SARS-coronavirus (SARS-CoV) proteins, we have solved the structure of the non-structural protein 9 (nsp9). This protein, encoded by ORF1a, has no designated function but is most likely involved with viral RNA synthesis. The protein comprises a single β-barrel with a fold previously unseen in single domain proteins. The fold superficially resembles...
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