Autoregulation of pituitary corticotroph SOCS-3 expression: characterization of the murine SOCS-3 promoter.
Authors:Auernhammer CJ, Bousquet C, Melmed S
Journal:Proc Natl Acad Sci U S A
PubMed ID:10359822
'Pituitary corticotroph SOCS-3 is a novel intracellular regulator of leukemia inhibitory factor (LIF)-mediated proopiomelanocortin gene expression and adrenocorticotropic hormone (ACTH) secretion, inhibiting LIF-activated Janus kinase-signal transducers and activators of transcription (STAT) signaling in a negative autoregulatory loop. We now demonstrate in corticotroph AtT-20 cells that LIF-stimulated endogenous SOCS-3 mRNA expression ... More
Single base mismatches in the mRNA target site allow specific seed region-mediated off-target binding of siRNA targeting human coagulation factor 7.
Authors:Ravon M, Berrera M, Ebeling M, Certa U
Journal:RNA Biol
PubMed ID:22258146
'We have analyzed the off-target activity of two siRNAs (F7-1, F7-2) that knock-down human blood coagulation factor 7 mRNA. F7-1 modulates a significant number of non-target transcripts while F7-2 shows high selectivity for the target transcript under various experimental conditions. The 3''-UTRs of all F7-1 off-target genes show statistically significant ... More
A host-specific function is required for ligation of a wide variety of ribozyme-processed RNAs.
Authors:Reid CE, Lazinski DW
Journal:Proc Natl Acad Sci U S A
PubMed ID:10618434
'Hepatitis delta virus (HDV) replicates its circular RNA genome via a rolling circle mechanism. During this process, cis-acting ribozymes cleave adjacent upstream sequences and thereby resolve replication intermediates to unit-length RNA. The subsequent ligation of these 5''OH and 2'',3''-cyclic phosphate termini to form circular RNA is an essential step in ... More
Characterization of a Ustilago maydis gene specifically induced during the biotrophic phase: evidence for negative as well as positive regulation.
Authors:Basse CW, Stumpferl S, Kahmann R.
Journal:Mol Cell Biol
PubMed ID:10594035
The phytopathogenic basidiomycete Ustilago maydis requires its host plant, maize, for completion of its sexual cycle. To investigate the molecular events during infection, we used differential display to identify plant-induced U. maydis genes. We describe the U. maydis gene mig1 (for ... More
Genetic engineering of phytochrome biosynthesis in bacteria.
Authors: Gambetta G A; Lagarias J C;
Journal:Proc Natl Acad Sci U S A
PubMed ID:11553807
The bilin prosthetic groups of the phytochrome photoreceptors and the light-harvesting phycobiliprotein antennae arise from the oxygen-dependent ring opening of heme. Two ferredoxin-dependent enzymes contribute to this conversion: a heme oxygenase and a bilin reductase with discrete double-bond specificity. Using a dual plasmid system, one expressing a truncated cyanobacterial apophytochrome ... More