Abstract
Azotobacter vinelandii undergoes a differentiation process to form metabolically dormant cells called cysts. Martínez-Ortiz et al. (e00135-20) identified c-di-GMP as a critical regulator for the production of alginates with specific content of guluronic residues, which are able to assemble the rigid laminated layers of the cyst envelope. Ahumada-Manuel et al. (e00134-20) showed that under vegetative conditions c-di-GMP favored the production of high-molecular-mass alginates. Although the allosteric activation of the alginate polymerase Alg8/Alg44 by c-di-GMP has long been recognized, the studies revealed that this regulator is also involved in the modification of alginate and is a key determinant of its physicochemical properties.
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