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Low CyaA expression and anti‐cooperative binding of cAMP to CRP frames the scope of the cognate regulon of Pseudomonas putida

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Date
2021-03
Author
Arce Rodríguez, Alejandro
Nikel Mayer, Pablo Iván
Calles, Belén
Chavarría Vargas, Max
Platero, Raúl
Krell, Tino
de Lorenzo, Víctor
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Abstract
Although the soil bacterium Pseudomonas putida KT2440 bears a bona fide adenylate cyclase gene (cyaA), intracellular concentrations of 30,50-cyclic adenosine monophosphate (cAMP) are barely detectable. By using reporter technology and direct quantification of cAMP under various conditions, we show that such low levels of the molecule stem from the stringent regulation of its synthesis, efflux and degradation. Poor production of cAMP was the result of inefficient translation of cyaA mRNA. Moreover, deletion of the cAMP-phosphodiesterase pde gene led to intracellular accumulation of the cyclic nucleotide, exposing an additional cause of cAMP drain in vivo. But even such low levels of the signal sustained activation of promoters dependent on the cAMP-receptor protein (CRP). Genetic and biochemical evidence indicated that the phenomenon ultimately rose from the unusual binding parameters of cAMP to CRP. This included an ultratight cAMP-CrpP. putida affinity (KD of 45.0   3.4 nM) and an atypical 1:1 effector/ dimer stoichiometry that obeyed an infrequent anticooperative binding mechanism. It thus seems that keeping the same regulatory parts and their relational logic but changing the interaction parameters enables genetic devices to take over entirely different domains of the functional landscape.
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https://hdl.handle.net/10669/86901
External link to the item
10.1111/1462-2920.15422
https://sfamjournals.onlinelibrary.wiley.com/doi/10.1111/1462-2920.15422
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  • Repositorios universitarios

  • Repositorio del SIBDI-UCR
  • Biblioteca Digital del CIICLA
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  • Biblioteca Digital Carlos Melendez (CIHAC)
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  • Scientific Electronic Library Online (SciELO)
  • Directory of Open Access Journals (DOAJ)
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Repositorio Institucional de la Universidad de Costa Rica. Algunos derechos reservados. Este repositorio funciona con DSpace.