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Compartmentalized cyanophycin metabolism in the diazotrophic filaments of a heterocystforming cyanobacteriumMireia Burnat, Antonia Herrero, and Enrique FloresInstituto de Bioqu ica Vegetal y Fotos tesis, Consejo Superior de Investigaciones Cient icas and Universidad de Sevilla, E-41092 Seville, Spain Edited by Robert Haselkorn, University of Chicago, Chicago, IL, and authorized January 24, 2014 (received for evaluation October two, 2013)intercellular communication| nitrogen fixationSignificanceThe heterocyst-forming cyanobacteria represent a accurate multicellular system identified in the bacterial planet that adds one of a kind capabilities to biodiversity.Fmoc-α-Me-Gly(Pentynyl)-OH In stock They develop as chains of cells containing two metabolically interdependent cellular types, the vegetative cells that fix carbon dioxide performing oxygenic photosynthesis and also the dinitrogen-fixing heterocysts.PMID:34816786 Heterocysts accumulate a cell inclusion, cyanophycin [multi-L-arginyl-poly (L-aspartic acid)], as a nitrogen reservoir. We have located that the second enzyme of cyanophycin catabolism, isoaspartyl dipeptidase, is present at drastically larger levels in vegetative cells than in heterocysts, identifying the nitrogen-rich dipeptide -aspartyl-arginine as a nitrogen vehicle for the vegetative cells and showing that compartmentalization of a catabolic route is utilized to enhance the physiology of nitrogen fixation.Author.
