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Poly(A)-containing ribonucleoprotein (poly(A)+-RNP) particles in the post-mitochondrial supernatant of cryptobiotic embryos of Artemia salina were characterized by hybridization to [3H]-poly(U). By sucrose isopycnic centrifugation, approximately 2/3 of poly(A)+-RNPs was found to band at 1.27-1.30 (g/cm3) and the rest 1+/3 at 1.20-1.23 (g/cm3) and below 1.20 (g/cm3). The 1.27-1.30 RNPs could be separated into two density classes, 1.27-1.28 and 1.30 (g/cm3) respectively. The latter RNP class was apparently complexed with ribosomal components because they were completely converted to the former RNP class (free RNPs) by 25 mM EDTA treatment. Further, the 1.30 (g/cm3) RNPs were resolved into several RNP species having sedimentation coefficients above 50 S. which were transformed mostly to 20-30 S rnps in the presence of 25 mM EDTA. The free 20-30 S RNPs contained 8-14 S poly(A)+-RNAs, having the highest template activity in a wheat embryo cell-free system, whereas the 1.20-1.23 poly(A)+-RNPs consisted of 10 S and 16 S RNPs, both of which contained 4 S poly(A)-containing sequences without any template activity.

Messenger ribonucleoprotein complexes of cryptobiotic embryos of Artemia salina