Abstract：
:ABC (ATP-binding cassette) transporters are members of a large superfamily of proteins that utilize ATP hydrolysis to translocate a wide range of substrates across biological membranes. In general, members of C subfamily (ABCC) are structurally characterized by an additional (N-terminal) transmembrane domain (TMD0). Phylogenetic analysis of plant ABCCs separates their protein sequences into three distinct clusters: I and II are plant specific whereas cluster III contains both human and plant ABCCs. Screening of the Plant Medicinal Genomics Resource database allowed us to identify 16 ABCCs partial sequences in Catharanthus roseus; two of which belong to the unique CrABCC1 transcript that we identified in cluster III. Genomic organization of CrABCC1 TMD0 coding sequence displays an AT-AC U12-type intron that is conserved in higher plant orthologues. We showed that CrABCC1, like its human orthologue ABCC10, produces alternative transcripts that encode protein sequences with a truncated form of TMD0 without the first transmembrane span (TM1). Subcellular localization of CrABCC1 TMD0 variants using yellow fluorescent protein fusions reveals that the TM1 is required for a correct routing of the TMD0 to the tonoplast. Finally, the specific repartition of CrABCC1 orthologues in some species suggests that this gene was lost several times during evolution and that its physiological function may, rely on a common feature of multicellular eukaryotes.
journal_name
J Genetjournal_title
Journal of geneticsauthors
El-Guizani T,Guibert C,Triki S,St-Pierre B,Ducos Edoi
10.1007/s12041-014-0327-6subject
Has Abstractpub_date
2014-04-01 00:00:00pages
21-33issue
1eissn
0022-1333issn
0973-7731journal_volume
93pub_type
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