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. 1986 May 12;14(9):3827–3839. doi: 10.1093/nar/14.9.3827

Peculiar feature of the organization of rRNA genes of the Chlorella chloroplast DNA.

T Yamada, M Shimaji
PMCID: PMC339818  PMID: 3714498

Abstract

The organization of a cloned rRNA gene cluster from Chlorella ellipsoidea chloroplast DNA (cpDNA) has been analyzed. Southern hybridization experiments with labelled chloroplast rRNAs as probes revealed an extraordinarily large size of the 16S-23S rRNA spacer region, ca. 4.8 kbp, almost twice as large as those of most higher plants. The nucleotide sequence determined on this region has shown that: (1) The tRNAIle gene locating in this region is similar to those of higher plant chloroplasts, blue-green algae and E. coli but does not contain any introns in contrast to higher plant chloroplasts. (2) The tRNAAla gene is absent from this region. (3) There are four open reading frames (ORFs) coding for 55, 102, 107 and 110 amino acids, respectively. (4) A few sets of unique sequence were found repeatedly in this region. (5) The 23S rRNA gene is coded on the opposite strand in the reverse order. This arrangement of the 16S-23S rRNA region of Chlorella cpDNA is quite different from any of those reported so far for various organisms.

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Selected References

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