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Negative regulation of STAT92E by an N-terminally truncated STAT protein derived from an alternative promoter site.


ABSTRACT: Previously unrecognized mRNAs originating from a dual promoter at the stat92E locus are described. One of these encodes a truncated protein, DeltaNSTAT92E, that lacks the N-terminal 133 amino acids. Antibodies detect both the full-length and truncated molecules early in embryogenesis (1-5 h), and mRNA detection by specific RT-PCR reactions accords with the protein distribution. Given that the N termini of mammalian STATs are known to have positive functions in transcriptional activation, we explored the role of DeltaNSTAT92E early in embryogenesis. By increasing the DeltaNSTAT92E-to-STAT92E ratio in overexpression and RNAi experiments, we observe phenotypes compatible with suppression of wild-type STAT92E activity. We therefore conclude that the short form of STAT92E is a naturally occurring dominant-negative product that can be added to the growing list of negative regulators of STAT activity.

SUBMITTER: Henriksen MA 

PROVIDER: S-EPMC187436 | biostudies-literature | 2002 Sep

REPOSITORIES: biostudies-literature

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Negative regulation of STAT92E by an N-terminally truncated STAT protein derived from an alternative promoter site.

Henriksen Melissa A MA   Betz Aurel A   Fuccillo Marc V MV   Darnell James E JE  

Genes & development 20020901 18


Previously unrecognized mRNAs originating from a dual promoter at the stat92E locus are described. One of these encodes a truncated protein, DeltaNSTAT92E, that lacks the N-terminal 133 amino acids. Antibodies detect both the full-length and truncated molecules early in embryogenesis (1-5 h), and mRNA detection by specific RT-PCR reactions accords with the protein distribution. Given that the N termini of mammalian STATs are known to have positive functions in transcriptional activation, we expl  ...[more]

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