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. 1990 May;10(5):2341–2348. doi: 10.1128/mcb.10.5.2341

A gene family for acidic ribosomal proteins in Schizosaccharomyces pombe: two essential and two nonessential genes.

M Beltrame 1, M E Bianchi 1
PMCID: PMC360582  PMID: 2325655

Abstract

We have cloned the genes for small acidic ribosomal proteins (A-proteins) of the fission yeast Schizosaccharomyces pombe. S. pombe contains four transcribed genes for small A-proteins per haploid genome, as is the case for Saccharomyces cerevisiae. In contrast, multicellular eucaryotes contain two transcribed genes per haploid genome. The four proteins of S. pombe, besides sharing a high overall similarity, form two couples of nearly identical sequences. Their corresponding genes have a very conserved structure and are transcribed to a similar level. Surprisingly, of each couple of genes coding for nearly identical proteins, one is essential for cell growth, whereas the other is not. We suggest that the unequal importance of the four small A-proteins for cell survival is related to their physical organization in 60S ribosomal subunits.

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Selected References

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