Light-Regulated Synthesis of Cyclic-di-GMP by a Bidomain Construct of the Cyanobacteriochrome Tlr0924 (SesA) without Stable Dimerization

Biochemistry
Matthew Blain-HartungJ Clark Lagarias

Abstract

Phytochromes and cyanobacteriochromes (CBCRs) use double-bond photoisomerization of their linear tetrapyrrole (bilin) chromophores within cGMP-specific phosphodiesterases/adenylyl cyclases/FhlA (GAF) domain-containing photosensory modules to regulate activity of C-terminal output domains. CBCRs exhibit photocycles that are much more diverse than those of phytochromes and are often found in large modular proteins such as Tlr0924 (SesA), one of three blue light regulators of cell aggregation in the cyanobacterium Thermosynechococcus elongatus. Tlr0924 contains a single bilin-binding GAF domain adjacent to a C-terminal diguanylate cyclase (GGDEF) domain whose catalytic activity requires formation of a dimeric transition state presumably supported by a multidomain extension at its N-terminus. To probe the structural basis of light-mediated signal propagation from the photosensory input domain to a signaling output domain for a representative CBCR, these studies explore the properties of a bidomain GAF-GGDEF construct of Tlr0924 (Tlr0924Δ) that retains light-regulated diguanylate cyclase activity. Surprisingly, circular dichroism spectroscopy and size exclusion chromatography data do not support formation of stable dimers in either ...Continue Reading

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Citations

Apr 11, 2018·The Journal of Biological Chemistry·Matthew Blain-HartungJ Clark Lagarias
Oct 28, 2020·Proceedings of the National Academy of Sciences of the United States of America·Marcus V MorenoJ Clark Lagarias
Mar 18, 2021·Proceedings of the National Academy of Sciences of the United States of America·Sepalika BandaraXiaojing Yang
Dec 24, 2020·The Journal of Physical Chemistry. B·Jonathan A ClingerGeorge N Phillips

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