Oct 1, 1989

Binding of globin mRNA, beta-globin mRNA segments and RNA homopolymers by immobilized protein of polysomal globin messenger ribonucleoprotein

European Journal of Biochemistry
M GörlachK Hilse


The binding of rabbit globin mRNA, in-vitro-generated beta-globin mRNA segments, and RNA homopolymers by proteins of rabbit reticulocyte polysomal messenger ribonucleoproteins (mRNP) after SDS gel electrophoresis and electroblotting was examined. The polysomal mRNP proteins have a higher affinity for mRNA than for rRNA and tRNA while having a higher affinity for polypurine than polypyrimidine homopolymers. Binding experiments with synthetic poly(A) and with segments of beta-globin mRNA transcribed from a cDNA in vitro revealed a set of polysomal mRNP proteins which preferentially bind the poly(A)-free beta-globin mRNA. A protein of Mr 90,000 binds specifically the 3'-nontranslated trailer of the poly(A)-free beta-globin mRNA and not the poly(A)-containing globin mRNA. Another set of proteins preferentially binds poly(A). The latter group of proteins contains a prominent species of Mr 72,000, which is most likely the rabbit poly(A)-binding protein. Three polysomal mRNP proteins which bound rabbit globin mRNA did not bind preferentially any of the other RNA probes used.

Mentioned in this Paper

MT-TA gene
PABPC1 gene
Triplet Codon-amino Acid Adaptor Activity
Transfer RNA
Ribosomal RNA
Poly(A)-Binding Proteins
Staphylococcal Protein A

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