PMID:22753061

Citation	Hull, TD, Ryu, MH, Sullivan, MJ, Johnson, RC, Klena, NT, Geiger, RM, Gomelsky, M and Bennett, JA (2012) Cyclic Di-GMP Phosphodiesterases RmdA and RmdB Are Involved in Regulating Colony Morphology and Development in Streptomyces coelicolor. J. Bacteriol. 194:4642-51
Abstract	Cyclic dimeric GMP (c-di-GMP) regulates numerous processes in Gram-negative bacteria, yet little is known about its role in Gram-positive bacteria. Here we characterize two c-di-GMP phosphodiesterases from the filamentous high-GC Gram-positive actinobacterium Streptomyces coelicolor, involved in controlling colony morphology and development. A transposon mutation in one of the two phosphodiesterase genes, SCO0928, hereby designated rmdA (regulator of morphology and development A), resulted in decreased levels of spore-specific gray pigment and a delay in spore formation. The RmdA protein contains GGDEF-EAL domains arranged in tandem and possesses c-di-GMP phosphodiesterase activity, as is evident from in vitro enzymatic assays using the purified protein. RmdA contains a PAS9 domain and is a hemoprotein. Inactivation of another GGDEF-EAL-encoding gene, SCO5495, designated rmdB, resulted in a phenotype identical to that of the rmdA mutant. Purified soluble fragment of RmdB devoid of transmembrane domains also possesses c-di-GMP phosphodiesterase activity. The rmdA rmdB double mutant has a bald phenotype and is impaired in aerial mycelium formation. This suggests that RmdA and RmdB functions are additive and at least partially overlapping. The rmdA and rmdB mutations likely result in increased local pools of intracellular c-di-GMP, because intracellular c-di-GMP levels in the single mutants did not differ significantly from those of the wild type, whereas in the double rmdA rmdB mutant, c-di-GMP levels were 3-fold higher than those in the wild type. This study highlights the importance of c-di-GMP-dependent signaling in actinomycete colony morphology and development and identifies two c-di-GMP phosphodiesterases controlling these processes.
Links	PubMed PMC3415515 Online version:10.1128/JB.00157-12
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
STRCO:Q9Z584		GO:0043581: mycelium development	ECO:0000315:		P		Figure 1. Shows the effects on the morphology of S. coelicolor from the inactivation of RmdA and RmdB.	complete CACAO 5300
STRCO:Q9Z584		GO:0004112: cyclic-nucleotide phosphodiesterase activity	ECO:0000314:		F		Figure 5. Correctly shows that RmdB has PDE activiy because it is has increase in swimming zones in semisolid agar of E. coli strain MG1655 yhjH with MBP-RmdA and MBP-RmdB	complete CACAO 6019
STRCO:Q9Z584	enables	GO:0004112: cyclic-nucleotide phosphodiesterase activity	ECO:0000314: direct assay evidence used in manual assertion		F		Seeded From UniProt	complete
STRCO:Q9RCY2		GO:0043934: sporulation	ECO:0000315:		P		Figure 1	complete CACAO 5235

References

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