5W10

Lcd1 GAF domain in complex with cAMP ligand

Summary for 5W10

• Entry DOI: 10.2210/pdb5w10/pdb
• Descriptor: cGMP-specific phosphodiesterase, ADENOSINE-3',5'-CYCLIC-MONOPHOSPHATE (3 entities in total)
• Functional Keywords: gaf domain, camp binding domain, effector domain, regulates the dgc activity of the ggdef domain, hydrolase
• Biological source: Leptospira interrogans serogroup Icterohaemorrhagiae serovar copenhageni (strain Fiocruz L1-130)
• Total number of polymer chains: 4
• Total formula weight: 90266.92

Authors

Guzzo, C.R.,Maciel, N.K.,Barbosa, A.S.,Farah, C.S. (deposition date: 2017-06-01, release date: 2017-06-28, Last modification date: 2024-10-16)

Primary citation

da Costa Vasconcelos, F.N.,Maciel, N.K.,Favaro, D.C.,de Oliveira, L.C.,Barbosa, A.S.,Salinas, R.K.,de Souza, R.F.,Farah, C.S.,Guzzo, C.R.
Structural and Enzymatic Characterization of a cAMP-Dependent Diguanylate Cyclase from Pathogenic Leptospira Species.
J. Mol. Biol., 429:2337-2352, 2017

PubMed Abstract: Leptospira interrogans serovar Copenhageni is a human pathogen that causes leptospirosis, a worldwide zoonosis. The L. interrogans genome codes for a wide array of potential diguanylate cyclase (DGC) enzymes with characteristic GGDEF domains capable of synthesizing the cyclic dinucleotide c-di-GMP, known to regulate transitions between different cellular behavioral states in bacteria. Among such enzymes, LIC13137 (Lcd1), which has an N-terminal cGMP-specific phosphodiesterases, adenylyl cyclases, and FhlA (GAF) domain and a C-terminal GGDEF domain, is notable for having close orthologs present only in pathogenic Leptospira species. Although the function and structure of GGDEF and GAF domains have been studied extensively separately, little is known about enzymes with the GAF-GGDEF architecture. In this report, we address the question of how the GAF domain regulates the DGC activity of Lcd1. The full-length Lcd1 and its GAF domain form dimers in solution. The GAF domain binds specifically cAMP (K of 0.24μM) and has an important role in the regulation of the DGC activity of the GGDEF domain. Lcd1 DGC activity is negligible in the absence of cAMP and is significantly enhanced in its presence (specific activity of 0.13s). The crystal structure of the Lcd1 GAF domain in complex with cAMP provides valuable insights toward explaining its specificity for cAMP and pointing to possible mechanisms by which this cyclic nucleotide regulates the assembly of an active DGC enzyme.

PubMed: 28601495
DOI: 10.1016/j.jmb.2017.06.002

Experimental method

X-RAY DIFFRACTION (2.15 Å)