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Nucleic Acids Research, 1981, Vol. 9, No. 7 1657-1674
© 1981

MOLECULAR BIOLOGY

Heterogeneity of the 5' terminus of hen ovalbumin messenger ribonucleic acid

Lawrence T. Malek*, William H. Eschenfeldt*, Theodore W. Munns+ and Robert E. Rhoads*

*Department of Biochemistry, University of Kentucky Lexington, KY 40536, USA +Washington University School of Medicine, Washington University St. Louis, MO 63110, USA

Received December 1, 1980. The 5'-terminal sequence of hen ovalbumin mRNA was investigated using a novel labeling method. Ovalbumin mRNA was purified by hybridization to complementary DNA coupled to cellulose. The mRNA thus purified was shown to be 97.9% pure by hybridization with plasmid DNA containing sequences to the messengers coding for conalbumin and ovomucoid, the next two most abundant messengers of oviduct. After digestion with RNase T1 and alkaline phosphatase, 5'-terminal capped oligonucleotides were selected by binding to anti-m7G-Sepharose. These were then labeled using RNA ligase and [5'-32P]pCp, separated by two-dimensional gel electrophoresis, and sequenced by partial digestion with base-specific ribonucleases. A nested set of three capped oligonucleotides was identified. Their structures and relative abundances were m7GpppAUACAG, 3%; m7GpppACAUACAG, 61% and m7GpppGUACAUACAG, 36%.


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