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. 2003 Nov;57(5):555-61.
doi: 10.1007/s00239-003-2509-3.

A novel family of unconventional actins in volvocalean algae

Takako Kato-Minoura  1 , Masayo Okumura, Masafumi Hirono, Ritsu Kamiya
Affiliations

A novel family of unconventional actins in volvocalean algae

Takako Kato-Minoura et al. J Mol Evol. 2003 Nov.

Abstract

The unicellular green alga Chlamydomonas reinhardtii has two actin genes, one encoding a conventional actin (90% amino acid identity with mammalian actin), the other a highly divergent actin (64% identity) named novel actin-like protein (NAP). To see whether the presence of conventional and unconventional actins in a single organism is unique to C. reinhardtii, we searched for genomic sequences related to the NAP sequence in several other species of volvocalean algae. Here we show that Chlamydomonas moewusii and Volvox carteri also have, in addition to a conventional actin, an unconventional actin similar to the C. reinhardtii NAP. Analyses of the deduced protein sequences indicated that the NAP homologues form a distinct group derived from conventional actin.

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