Abstract:
:Light-harvesting-like (LIL) proteins are low-molecular-mass membrane proteins related to the light-harvesting complexes, which form the dominant antenna system in most photosynthetic eukaryotes. To analyze the LIL protein family, we mined a number of publicly available databases to identify members of this family in a broad range of organisms. LIL proteins are diverse, having one to three predicted transmembrane helices. One- and two-helix LIL proteins were found in all the major photosynthetic eukaryote lineages (glaucophytes, red algae, and green algae) and are particularly well conserved in the green algae and land plants. In most cases, however, these proteins are not conserved between major lineages, and in some cases appear to have evolved independently. Three-helix LIL proteins are well conserved within the gymnosperms and angiosperms, but are much more divergent, and have been duplicated multiple times, in the green algae and bryophytes. We also identified a novel LIL protein in two Micromonas strains that contains a fourth hydrophobic region. This analysis identifies conserved members of the LIL protein family, signifying their importance to photosynthetic eukaryotes. It also indicates that classification of these proteins based on structural characteristics alone inadequately reflects the evolutionary history observed in this complex protein family.
journal_name
Genomejournal_title
Genomeauthors
Neilson JA,Durnford DGdoi
10.1139/g09-081subject
Has Abstractpub_date
2010-01-01 00:00:00pages
68-78issue
1eissn
0831-2796issn
1480-3321pii
g09-081journal_volume
53pub_type
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