New and important roles for DMSP in marine microbial communities
New and important roles for DMSP in marine microbial communities
复制标题
DOI：
10.1016/s1385-1101(00)00023-x
复制
发表时间：
2000-08-01
影响因子：
2
通讯作者：
Bruton, JA
中科院分区：
文献类型：
--
作者：
Kiene, RP;Linn, LJ;Bruton, JA
藻类渗透物二甲基磺基丙酸盐（DMSP）被认为是海洋二甲基硫（DMS）的主要前体，DMS是一种影响大气化学和全球气候的挥发性硫化合物。最近的研究，使用S-35-DMSP示踪技术，表明DMSP可能发挥额外的非常重要的作用，在微生物生态学和海洋地球化学的表面。DMSP可以作为细菌从海水中吸收植物甾醇衍生的DMSP的细胞内渗透剂。此外，DMSP似乎支持表层沃茨中1%至13%的细菌碳需求，使其成为迄今为止确定的浮游细菌最重要的单一基质之一。此外，硫从DMSP有效地纳入细菌蛋白质（主要是蛋氨酸）和DMSP似乎是一个主要来源的海洋浮游细菌的硫。DMSP的同化代谢是通过去甲基化/去甲硫氨酸途径产生的，该途径主导DMSP的原位降解。基于DMSP的同化代谢和细菌生长之间的联系，我们提供了一个假设，即DMSP的可用性细菌控制生产的DMS的竞争DMSP裂解酶途径。与DMSP的同化代谢有关的还有过量MeSH的产生，如果不被同化为蛋白质，则反应形成溶解的非挥发性化合物。其中包括硫酸盐和DOM-金属-MeSH复合物，两者都是DMSP降解的主要短期最终产物。由于海水中MeSH的生成速率很高（3-90 nM d（-1）），因此MeSH与痕量金属的反应可能会影响海水中金属的可用性和化学性质。总体而言，最近的研究结果提供的证据表明，DMSP在海洋微生物群落的碳，硫，也许金属和DOM循环中发挥着重要作用。这些研究结果，再加上一小部分DMSP转化为二甲硫醚可能影响大气化学和气候动力学的事实，提请注意DMSP作为一种对海洋地球化学和生态过程至关重要的分子。(C)2000 Elsevier Science B. V.保留所有权利。
The algal osmolyte dimethylsulfoniopropionate (DMSP) is recognised as the major precursor of marine dimethylsulfide (DMS), a volatile sulfur compound that affects atmospheric chemistry and global climate. Recent studies, using S-35-DMSP tracer techniques, suggest that DMSP may play additional very important roles in the microbial ecology and biogeochemistry of the surface ocean. DMSP may serve as an intracellular osmolyte in bacteria that take up phytoplankton-derived DMSP from seawater. In addition, DMSP appears to support from 1 to 13% of the bacterial carbon demand in surface waters, making it one of the most significant single substrates for bacterioplankton so far identified. Furthermore, the sulfur from DMSP is efficiently incorporated into bacterial proteins (mostly into methionine) and DMSP appears to be a major source of sulfur for marine bacterioplankton. Assimilatory metabolism of DMSP is via methanethiol (MeSH) chat is produced by a demethylation/demethiolation pathway which dominates DMSP degradation in situ. Based on the linkage between assimilatory metabolism of DMSP and bacterial growth, we offer a hypothesis whereby DMSP availability to bacteria controls the production of DMS by the competing DMSP lyase pathway. Also linked with the assimilatory metabolism of DMSP is the production of excess MeSH which, if not assimilated into protein, reacts to form dissolved non-volatile compounds. These include sulfate and DOM-metal-MeSH complexes, both of which represent major short-term end-products of DMSP degradation. Because production rates of MeSH in seawater are high (3-90 nM d(-1)), reaction of MeSH with trace metals could affect metal availability and chemistry in seawater. Overall, results of recent studies provide evidence that DMSP plays important roles in the carbon, sulfur and perhaps metal and DOM cycles in marine microbial communities. These findings, coupled with the fact that the small fraction of DMSP converted to DMS may influence atmospheric chemistry and climate dynamics, draws attention to DMSP as a molecule of central importance to marine biogeochemical and ecological processes. (C) 2000 Elsevier Science B.V. All rights reserved.