A nodule-specific protein secretory pathway required for nitrogen-fixing symbiosis
The nitrogen-fixing symbiosis between Sinorhizobium meliloti and its leguminous host plant Medicago truncatula occurs in a specialized root organ called the nodule. Bacteria that are released into plant cells are surrounded by a unique plant membrane compartment termed a symbiosome. We found that in the symbiosis-defective dnf1 mutant of M. truncatula, bacteroid and symbiosome development are blocked. We identified the DNF1 gene as encoding a subunit of a signal peptidase complex that is highly expressed in nodules. By analyzing data from whole-genome expression analysis, we propose that correct symbiosome development in M. truncatula requires the orderly secretion of protein constituents through coordinated up-regulation of a nodule-specific pathway exemplified by DNF1
Main Authors: | , , , , , , , |
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Format: | Article/Letter to editor biblioteca |
Language: | English |
Subjects: | define, endoplasmic-reticulum, fixation, gene-expression, medicago-truncatula, membrane, mutants, plant, root-nodules, signal peptidase activity, |
Online Access: | https://research.wur.nl/en/publications/a-nodule-specific-protein-secretory-pathway-required-for-nitrogen |
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