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This compound influences key lifestyle decisions such as motility, biofilm formation, or virulence. Although many diguanylate cyclases (DGCs) combined with various sensory domains have been studied previously, how distinct inputs are integrated within individual enzymes remains incompletely understood. Here, we investigate a cyanobacterial family of dual sensor DGCs that combine an N\u2010terminal receiver (Rec) domain followed by a light\u2010oxygen\u2010voltage (LOV) domain upstream of a diguanylate cyclase (GGDEF) domain. Using in vivo activity screening and in vitro characterization, we determined how phosphorylation and blue light, individually and jointly, regulate enzymatic activity. By measuring kinetic parameters across four defined functional states, unphosphorylated or phosphorylated, in combination with dark or light states, we reveal logic gate\u2010like behaviors. One representative,\n                    <jats:italic>La<\/jats:italic>\n                    RldC, integrates both signals with pronounced fold\u2010changes in activity, consistent with overall OR\u2010type logic and with light acting as the dominant input. Our results demonstrate its function as a molecular gate coupling phosphorylation and illumination sensing to cyclic\u2010di\u2010GMP formation. These findings provide valuable insights into multi\u2010signal decision\u2010making in cyanobacteria and establish further understanding of how modular sensory domains are wired to control bacterial second\u2010messenger signaling.\n                  <\/jats:p>","DOI":"10.1002\/pro.70765","type":"journal-article","created":{"date-parts":[[2026,8,24]],"date-time":"2026-08-24T11:36:50Z","timestamp":1787571410000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Molecular logics in dual sensor regulation of diguanylate cyclase activity\u2014Phosphorylation\n                    <scp>OR<\/scp>\n                    blue\u2010light activation"],"prefix":"10.1002","volume":"35","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-5747-2082","authenticated-orcid":false,"given":"Maximilian","family":"Fuchs","sequence":"first","affiliation":[{"name":"Institute of Biochemistry Graz University of Technology  Graz 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