TY - JOUR
T1 - Small cytoplasmic RNAs from human placental free mRNPs
T2 - Structure and their effect on in vitro protein synthesis
AU - LORBERBOUM, Haya
AU - DIGWEED, Martin
AU - ERDMANN, Volker A.
AU - SERVADIO, Yael
AU - WEINSTEIN, Daniel
AU - GROOT, Nathan DE
AU - HOCHBERG, Abraham A.
PY - 1986/3
Y1 - 1986/3
N2 - A new family of small cytoplasmic RNA species (scRNAs) was found to be associated with human termplacental free messenger ribonucleoprotein particles (mRNPs). Placental scRNAs strongly inhibit translation of both homologous and heterologous mRNAs in a cell‐free rabbit reticulocyte system. scRNAs could be resolved into at least four different RNA species. One of the RNA molecules, scRNA species 1, was the most potent protein synthesis inhibitor found among the placental scRNAs. The nucleotide sequence of the scRNA species 1 was determined. In spite of its short length, scRNA species 1 still exhibited a very strong inhibitory effect on the in vitro protein synthesis. scRNAs were found to be complexed with proteins in the form of scRNPs. Proteins of these complexes enhanced the inhibitory effect of scRNAs on in vitro translation. Experiments provided evidence that inhibition of in vitro protein synthesis by the scRNAs is not dependent upon mRNA concentration. However, inhibition can be overcome by increasing the ratio lysate/scRNAs, thus suggesting that scRNAs act on some essential component of the cell‐free system. The degree of inhibition is decreased when scRNAs are added after the start of translation, suggesting that scRNAs (or scRNPs) interfere with the initiation stage of translation, probably acting on an initiation factor(s). Placental scRNAs are unique in their size, being smaller than other known scRNAs. Their association with free cytoplasmic repressed mRNPs in human placenta suggests that scRNAs play a role in the regulation of mRNP metabolism and, consequently, in the control of mRNA translation.
AB - A new family of small cytoplasmic RNA species (scRNAs) was found to be associated with human termplacental free messenger ribonucleoprotein particles (mRNPs). Placental scRNAs strongly inhibit translation of both homologous and heterologous mRNAs in a cell‐free rabbit reticulocyte system. scRNAs could be resolved into at least four different RNA species. One of the RNA molecules, scRNA species 1, was the most potent protein synthesis inhibitor found among the placental scRNAs. The nucleotide sequence of the scRNA species 1 was determined. In spite of its short length, scRNA species 1 still exhibited a very strong inhibitory effect on the in vitro protein synthesis. scRNAs were found to be complexed with proteins in the form of scRNPs. Proteins of these complexes enhanced the inhibitory effect of scRNAs on in vitro translation. Experiments provided evidence that inhibition of in vitro protein synthesis by the scRNAs is not dependent upon mRNA concentration. However, inhibition can be overcome by increasing the ratio lysate/scRNAs, thus suggesting that scRNAs act on some essential component of the cell‐free system. The degree of inhibition is decreased when scRNAs are added after the start of translation, suggesting that scRNAs (or scRNPs) interfere with the initiation stage of translation, probably acting on an initiation factor(s). Placental scRNAs are unique in their size, being smaller than other known scRNAs. Their association with free cytoplasmic repressed mRNPs in human placenta suggests that scRNAs play a role in the regulation of mRNP metabolism and, consequently, in the control of mRNA translation.
UR - http://www.scopus.com/inward/record.url?scp=0022518121&partnerID=8YFLogxK
U2 - 10.1111/j.1432-1033.1986.tb09487.x
DO - 10.1111/j.1432-1033.1986.tb09487.x
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C2 - 2420584
AN - SCOPUS:0022518121
SN - 0014-2956
VL - 155
SP - 279
EP - 287
JO - European Journal of Biochemistry
JF - European Journal of Biochemistry
IS - 2
ER -