Mammalian orthologues of a yeast regulator of nonsense transcript stability.
All eukaryotes that have been studied to date possess the ability to detect and degrade transcripts that contain a premature signal for the termination of translation. This process of nonsense-mediated RNA decay has been most comprehensively studied in the yeast Saccharomyces cerevisiae where at least three trans-acting factors (Upf1p through Upf3P) are required. We have cloned cDNAs encoding human and murine homologues of Upf1p, termed rent1 (regulator of nonsense transcripts). Rent1 is the first identified mammalian protein that contains all of the putative functional elements in Upf1p including zinc finger-like and NTPase domains, as well as all motifs common to members of helicase superfamily I. Moreover, expression of a chimeric protein, N and C termini of Upf1p, complements the Upf1p-deficient phenotype in yeast. Thus, despite apparent differences between yeast and mammalian nonsense-mediated RNA decay, these data suggest that the two pathways use functionally related machinery.
Perlick
H A
HA
Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
Medghalchi
S M
SM
Spencer
F A
FA
Kendzior
R J
RJ
Dietz
H C
HC
D000251:Adenosine Triphosphatases / Q000235:genetics; D000595:Amino Acid Sequence; D000818:Animals; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D018389:Codon, Nonsense; D016384:Consensus Sequence; D004265:DNA Helicases / Q000235:genetics; D005656:Fungal Proteins / Q000235:genetics*; D015966:Gene Expression Regulation, Fungal; D005816:Genetic Complementation Test; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D020365:RNA Helicases; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D016415:Sequence Alignment; D015534:Trans-Activators / Q000235:genetics*
D018389:Codon, Nonsense; D005656:Fungal Proteins; D012333:RNA, Messenger; C484446:Rent1 protein, mouse; D029701:Saccharomyces cerevisiae Proteins; D015534:Trans-Activators; D000251:Adenosine Triphosphatases; C074151:NAM7 protein, S cerevisiae; D004265:DNA Helicases; D020365:RNA Helicases; C101828:UPF1 protein, human