Translational and structural requirements of the early nodulin gene enod40, a short-open reading frame-containing RNA, for elicitation of a cell-specific growth response in the alfalfa root cortex.
A diversity of mRNAs containing only short open reading frames (sORF-RNAs; encoding less than 30 amino acids) have been shown to be induced in growth and differentiation processes. The early nodulin gene enod40, coding for a 0.7-kb sORF-RNA, is expressed in the nodule primordium developing in the root cortex of leguminous plants after infection by symbiotic bacteria. Ballistic microtargeting of this gene into Medicago roots induced division of cortical cells. Translation of two sORFs (I and II, 13 and 27 amino acids, respectively) present in the conserved 5' and 3' regions of enod40 was required for this biological activity. These sORFs may be translated in roots via a reinitiation mechanism. In vitro translation products starting from the ATG of sORF I were detectable by mutating enod40 to yield peptides larger than 38 amino acids. Deletion of a Medicago truncatula enod40 region between the sORFs, spanning a predicted RNA structure, did not affect their translation but resulted in significantly decreased biological activity. Our data reveal a complex regulation of enod40 action, pointing to a role of sORF-encoded peptides and structured RNA signals in developmental processes involving sORF-RNAs.
Sousa
C
C
Institut des Sciences Végétales, Centre National de la Recherche Scientifique, F-91198 Gif-sur-Yvette Cedex, France.
Johansson
C
C
Charon
C
C
Manyani
H
H
Sautter
C
C
Kondorosi
A
A
Crespi
M
M
D001483:Base Sequence; D019470:Biolistics; D002455:Cell Division; D018507:Gene Expression Regulation, Developmental; D018506:Gene Expression Regulation, Plant; D018390:Gene Targeting; D017930:Genes, Reporter / Q000235:genetics; D007150:Immunohistochemistry; D000455:Medicago sativa / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D008969:Molecular Sequence Data; D009154:Mutation / Q000235:genetics; D009690:Nucleic Acid Conformation; D016366:Open Reading Frames / Q000235:genetics; D010455:Peptides / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D010937:Plant Growth Regulators / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D010940:Plant Proteins / Q000096:biosynthesis* / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D018517:Plant Roots / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism; D014176:Protein Biosynthesis / Q000235:genetics*; D062085:RNA, Long Noncoding; D018749:RNA, Plant / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D022661:RNA, Untranslated / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis
C405430:ENOD40 RNA; D010455:Peptides; D010937:Plant Growth Regulators; D010940:Plant Proteins; D062085:RNA, Long Noncoding; D018749:RNA, Plant; D022661:RNA, Untranslated; D011993:Recombinant Fusion Proteins