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|Title:||atSRp30, one of two SF2/ASF-like proteins from Arabidopsis thaliana, regulates splicing of specific plant genes|
|Citation:||Genes & Development, 1999; 13(8):987-1001|
|Publisher:||Cold Spring Harbor Lab Press|
|Sergiy Lopato, Maria Kalyna, Silke Dorner, Ryuji Kobayashi, Adrian R. Krainer and Andrea Barta|
|Abstract:||SR proteins are nuclear phosphoproteins with a characteristic Ser/Arg-rich domain and one or two RNA recognition motifs. They are highly conserved in animals and plants and play important roles in spliceosome assembly and alternative splicing regulation. We have now isolated and partially sequenced a plant protein, which crossreacts with antibodies to human SR proteins. The sequence of the corresponding cDNA and genomic clones fromArabidopsis revealed a protein, atSRp30, with strong similarity to the human SR protein SF2/ASF and to atSRp34/SR1, a previously identified SR protein, indicating that plants possess two SF2/ASF-like proteins.atSRp30 expresses alternatively spliced mRNA isoforms that are expressed differentially in various organs and during development. Overexpression of atSRp30 via a strong constitutive promoter resulted in changes in alternative splicing of several endogenous plant genes, including atSRp30 itself. Interestingly, atSRp30overexpression resulted in a pronounced down-regulation of endogenous mRNA encoding full-length atSRp34/SR1 protein. Transgenic plants overexpressing atSRp30 showed morphological and developmental changes affecting mostly developmental phase transitions.atSRp30- and atSRp34/SR1-promoter–GUSconstructs exhibited complementary expression patterns during early seedling development and root formation, with overlapping expression in floral tissues. The results of the structural and expression analyses of both genes suggest that atSRp34/SR1 acts as a general splicing factor, whereas atSRp30 functions as a specific splicing modulator.|
|Keywords:||SR proteins; alternative splicing; pre-mRNA processing; plant development; overexpression; phenotype|
|Rights:||Copyright © 1999 by Cold Spring Harbor Laboratory Press|
|Appears in Collections:||Agriculture, Food and Wine publications|
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