Structure and mechanism of a Hypr GGDEF enzyme that activates cGAMP signaling to control extracellular metal respiration
Abstract
A newfound signaling pathway employs a GGDEF enzyme with unique activity compared to the majority of homologs associated with bacterial cyclic di-GMP signaling. This system provides a rare opportunity to study how signaling proteins natively gain distinct function. Using genetic knockouts, riboswitch reporters, and RNA-Seq, we show that GacA, the Hypr GGDEF in Geobacter sulfurreducens, specifically regulates cyclic GMP-AMP (3′,3′-cGAMP) levels in vivo to stimulate gene expression associated with metal reduction separate from electricity production. To reconcile these in vivo findings with prior in vitro results that showed GacA was promiscuous, we developed a full kinetic model combining experimental data and mathematical modeling to reveal mechanisms that contribute to in vivo specificity. A 1.4 Å-resolution crystal structure of the Geobacter Hypr GGDEF domain was determined to understand the molecular basis for those mechanisms, including key cross-dimer interactions. Together these results demonstrate that specific signaling can result from a promiscuous enzyme.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 09, 2019
- Source ID
- 10.7554/elife.43959
Entities
People
- Chi Ho Chan
- Daniel R. Bond
- James J Park
- Kevin W Doxzen
- Ming C Hammond
- Philip J Kranzusch
- Todd A Wright
- Zachary F. Hallberg
Organizations
- Dana–Farber Cancer Institute
- Harvard Medical School
- National Institutes of Health
- National Science Foundation
- Office of Naval Research
- University of Minnesota
- University of Utah
- Yusuf Hamied Department of Chemistry