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Reference: Friedberg F (2011) Single and multiple CH (calponin homology) domain containing multidomain proteins in Arabidopsis and Saccharomyces: an inventory. Mol Biol Rep 38(1):213-8

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Abstract


Genes for individual domains such as CH, lim, ankyrin, PH and RhoGAP, IQ motif, Ig_FLMN, spectrin, and EF hand probably existed in early evolution before there were plants, fungi or animals so that when we examine multidomain proteins in Arabidopsis, Saccharomyces, Dictyostelium or Homo Sapiens we encounter various combinations of such domains. While all of these four species express Fimbrin and EB1, the lists of CH containing multidomain proteins, however, differ in number and in type for each of them. There was no further great increase in the number of new single domain proteins. Still many new multidomain genes evolved--but far more so in metazoans--than in plants or fungi. In both plants and fungi only singlet CH domains but no doublets (other than those forming the Fimbrin quadruplet) were incorporated. That is in these two branches one finds no alpha actinin, dystrophin or filamin even though the individual building blocks (i.e. domains such as spectrin or IG-FLMN) were available in Arabidopsis. Possibly transposons create new chimeric multidomain genes by mixing and matching genes or gene fragments.

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Friedberg F
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