Summary
The amino acid sequences of two barley ribosomal proteins, termed HvL17-1 and HvL17-2, were decoded from green leaf cDNA clones. The N-terminal sequences of the derived barley proteins are 48% identical to the N-terminal amino acid sequence of protein YL17 from the large subunit of yeast cytoplasmic ribosomes. Via archaebacterial ribosomal proteins this homology extends to ribosomal protein L22 from eubacteria and chloroplast. Barley L17, and ribosomal proteins L22 and L23 from the archaebacteria Halobacterium halobium and H. marismortui, are 25–33% identical. Interestingly, the barley and archaebacterial proteins share a long, central stretch of amino acids, which is absent in the corresponding proteins from eubacteria and chloroplasts.
Barley L17 proteins are encoded by a small gene family with probably only two members, represented by the cDNA clones encoding HvL17-1 and HvL17-2. Both these genes are active in green leaf cells. The expression of the L17 genes in different parts of 7-day old barley seedlings was analyzed by semiquantitative hybridization. The level of L17 mRNA is high in meristematic and young cells found in the leaf base and root tip. In the leaf, the L17 mRNA level rapidly decreases with increasing cell age, and in older root cells this mRNA is undetactable.
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Madsen, L.H., Kreiberg, J.D. & Gausing, K. A small gene family in barley encodes ribosomal proteins homologous to yeast YL17 and L22 from archaebacteria, eubacteria, and chloroplasts. Curr Genet 19, 417–422 (1991). https://doi.org/10.1007/BF00309605
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DOI: https://doi.org/10.1007/BF00309605