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Roney SH, Cepeda MR, Belgrad BA, Moore SG, Smee DL, Kubanek J, Weissburg MJ. Common fear molecules induce defensive responses in marine prey across trophic levels. Oecologia 2023; 202:655-667. [PMID: 37615742 DOI: 10.1007/s00442-023-05438-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Accepted: 08/03/2023] [Indexed: 08/25/2023]
Abstract
Predator-prey interactions are a key feature of ecosystems and often chemically mediated, whereby individuals detect molecules in their environment that inform whether they should attack or defend. These molecules are largely unidentified, and their discovery is important for determining their ecological role in complex trophic systems. Homarine and trigonelline are two previously identified blue crab (Callinectes sapidus) urinary metabolites that cause mud crabs (Panopeus herbstii) to seek refuge, but it was unknown whether these molecules influence other species within this oyster reef system. In the current study, homarine, trigonelline, and blue crab urine were tested on juvenile oysters (Crassostrea virginica) to ascertain if the same molecules known to alter mud crab behavior also affect juvenile oyster morphology, thus mediating interactions between a generalist predator, a mesopredator, and a basal prey species. Oyster juveniles strengthened their shells in response to blue crab urine and when exposed to homarine and trigonelline in combination, especially at higher concentrations. This study builds upon previous work to pinpoint specific molecules from a generalist predator's urine that induce defensive responses in two marine prey from different taxa and trophic levels, supporting the hypothesis that common fear molecules exist in ecological systems.
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Affiliation(s)
- Sarah H Roney
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, 30332, USA
- Brook Byers Institute for Sustainable Systems, Atlanta, GA, 30332, USA
| | - Marisa R Cepeda
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | | | - Samuel G Moore
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332, USA
- Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Delbert L Smee
- Dauphin Island Sea Lab, Dauphin Island, AL, 36528, USA.
- School of Marine and Environmental Sciences, University of South Alabama, Mobile, AL, 36608, USA.
| | - Julia Kubanek
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, 30332, USA
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA, 30332, USA
- Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Marc J Weissburg
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, 30332, USA
- Brook Byers Institute for Sustainable Systems, Atlanta, GA, 30332, USA
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Khatri Chhetri B, Bhanushali R, Liang Y, Cepeda MR, Niradininoco AK, Soapi K, Wan B, Qader M, Franzblau SG, Kubanek J. Isolation and Characterization of Anti-Mycobacterial Natural Products from a Petrosia sp. Marine Sponge. J Nat Prod 2023; 86:574-581. [PMID: 36881908 PMCID: PMC10043868 DOI: 10.1021/acs.jnatprod.2c01003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Indexed: 06/18/2023]
Abstract
Tuberculosis (TB) is a dreadful infectious disease and a leading cause of mortality and morbidity worldwide, second in 2020 only to severe acute respiratory syndrome 2 (SARS-Cov-2). With limited therapeutic options available and a rise in multidrug-resistant tuberculosis cases, it is critical to develop antibiotic drugs that display novel mechanisms of action. Bioactivity-guided fractionation employing an Alamar blue assay for Mycobacterium tuberculosis strain H37Rv led to the isolation of duryne (13) from a marine sponge Petrosia sp. sampled in the Solomon Islands. Additionally, five new strongylophorine meroditerpene analogues (1-5) along with six known strongylophorines (6-12) were isolated from the bioactive fraction and characterized using MS and NMR spectroscopy, although only 13 exhibited antitubercular activity.
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Affiliation(s)
- Bhuwan Khatri Chhetri
- School
of Chemistry and Biochemistry, Georgia Institute
of Technology, Atlanta, Georgia 30332, United States
| | - Riya Bhanushali
- School
of Biological Sciences, Georgia Institute
of Technology, Atlanta, Georgia 30332, United States
| | - Yifan Liang
- School
of Chemistry and Biochemistry, Georgia Institute
of Technology, Atlanta, Georgia 30332, United States
| | - Marisa R. Cepeda
- School
of Chemistry and Biochemistry, Georgia Institute
of Technology, Atlanta, Georgia 30332, United States
| | | | - Katy Soapi
- Institute
of Applied Sciences, University of South
Pacific, Suva, Fiji
- Pacific
Community, Suva, Fiji
| | - Baojie Wan
- Institute
for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
| | - Mallique Qader
- Institute
for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
| | - Scott G. Franzblau
- Institute
for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
| | - Julia Kubanek
- School
of Chemistry and Biochemistry, Georgia Institute
of Technology, Atlanta, Georgia 30332, United States
- Center
for Microbial Dynamics and Infection, Georgia
Institute of Technology, Atlanta, Georgia 30332, United States
- School
of Biological Sciences, Georgia Institute
of Technology, Atlanta, Georgia 30332, United States
- Parker
H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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Abstract
A review of chemically mediated interactions in planktonic marine environments covering new studies from January 2015 to December 2017.
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Affiliation(s)
- Emily R. Brown
- School of Biological Sciences
- Aquatic Chemical Ecology Center
- Institute for Bioengineering and Biosciences
- Georgia Institute of Technology
- Atlanta
| | - Marisa R. Cepeda
- School of Chemistry and Biochemistry
- Aquatic Chemical Ecology Center
- Institute for Bioengineering and Biosciences
- Georgia Institute of Technology
- Atlanta
| | - Samantha J. Mascuch
- School of Biological Sciences
- Aquatic Chemical Ecology Center
- Institute for Bioengineering and Biosciences
- Georgia Institute of Technology
- Atlanta
| | | | - Julia Kubanek
- School of Biological Sciences
- Aquatic Chemical Ecology Center
- Institute for Bioengineering and Biosciences
- Georgia Institute of Technology
- Atlanta
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Cepeda MR, McGarry L, Pennington JM, Krzystek J, Stroupe ME. The role of extended Fe 4S 4 cluster ligands in mediating sulfite reductase hemoprotein activity. Biochim Biophys Acta Proteins Proteom 2018; 1866:933-940. [PMID: 29852252 DOI: 10.1016/j.bbapap.2018.05.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 05/08/2018] [Accepted: 05/24/2018] [Indexed: 10/14/2022]
Abstract
The siroheme-containing subunit from the multimeric hemoflavoprotein NADPH-dependent sulfite reductase (SiR/SiRHP) catalyzes the six electron-reduction of SO32- to S2-. Siroheme is an iron-containing isobacteriochlorin that is found in sulfite and homologous siroheme-containing nitrite reductases. Siroheme does not work alone but is covalently coupled to a Fe4S4 cluster through one of the cluster's ligands. One long-standing hypothesis predicted from this observation is that the environment of one iron-containing cofactor influences the properties of the other. We tested this hypothesis by identifying three amino acids (F437, M444, and T477) that interact with the Fe4S4 cluster and probing the effect of altering them to alanine on the function and structure of the resulting enzymes by use of activity assays, X-ray crystallographic analysis, and EPR spectroscopy. We showed that F437 and M444 gate access for electron transfer to the siroheme-cluster assembly and the direct hydrogen bond between T477 and one of the cluster sulfides is important for determining the geometry of the siroheme active site.
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Affiliation(s)
- Marisa R Cepeda
- Department of Biological Science, Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306, USA; Department of Biological Sciences, Georgia Institute of Technology, 310 Ferst Dr. NW, Atlanta, CA 30332, USA
| | - Lauren McGarry
- Department of Biological Science, Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306, USA
| | - Joseph M Pennington
- Department of Biological Science, Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306, USA
| | - J Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA
| | - M Elizabeth Stroupe
- Department of Biological Science, Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306, USA
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