Possible influence of bacterial quorum sensing on the hydrolysis of sinking particulate organic carbon in marine environments

被引:70
|
作者
Hmelo, Laura R. [1 ]
Mincer, Tracy J. [1 ]
Van Mooy, Benjamin A. S. [1 ]
机构
[1] Woods Hole Oceanog Inst, Dept Marine Chem & Geochem, Woods Hole, MA 02543 USA
来源
ENVIRONMENTAL MICROBIOLOGY REPORTS | 2011年 / 3卷 / 06期
基金
美国国家科学基金会;
关键词
OCEAN; FLUX; AUTOINDUCERS; LUMINESCENCE; LACTONES; SYSTEM; MODEL;
D O I
10.1111/j.1758-2229.2011.00281.x
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A central component of the ocean's biological carbon pump is the export of sinking, photosynthetically derived, particulate organic carbon (POC). Bacteria colonize these particles and produce enzymes that hydrolyse sinking POC thereby acting as one of the major controls on the biological pump. Here we provide evidence that a bacterial cellcell communication mechanism, quorum sensing (QS), may influence the activity of hydrolytic enzymes on sinking particles. We collected sinking POC from a site off Vancouver Island, Canada and found that it contained acylated homoserine lactones (AHLs), a suite of well-known bacterial communication molecules. Furthermore, we observed that the addition of exogenous AHLs to incubations containing sinking POC affected the activity of key hydrolytic enzymes involved in POC degradation in some cases. Our results suggest that AHL-based QS could play an important role in regulating the degradation of sinking POC and that variability in AHL-triggered POC hydrolysis is a heretofore unrecognized process that impacts the marine biological carbon pump.
引用
收藏
页码:682 / 688
页数:7
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