异戊二烯(2-甲基-1,3-丁二烯)每年排放到大气中的数量足以与甲烷相媲美(>500TgCyr-1),主要是由于树木和其他植物的排放。异戊二烯与其他大气化合物的化学反应,如羟基自由基和无机氮物质(NOx),对全球变暖和当地空气质量有影响,分别。多年来,据估计,土壤细菌消耗大量的异戊二烯(~20TgCyr-1),但是对异戊二烯生物汇的潜在机制知之甚少。研究表明或证实了不同细菌属降解异戊二烯的能力,无论是通过规范的异型异戊二烯降解途径还是通过其他不太充分表征的机制。这里,我们回顾了异戊二烯代谢的最新知识,并强调了进一步研究的关键领域。特别是,近年来已鉴定出不利用异戊二烯单加氧酶的异戊二烯降解剂的实例。这对细菌吸收异戊二烯的机制都有令人着迷的意义,而且还用于环境中异戊二烯降解剂的生态学。本文受版权保护。保留所有权利。
Isoprene (2-methyl-1,3-butadiene) is emitted to the atmosphere each year in sufficient quantities to rival methane (>500 Tg C yr-1 ), primarily due to emission by trees and other plants. Chemical reactions of isoprene with other atmospheric compounds, such as hydroxyl radicals and inorganic nitrogen species (NOx ), have implications for global warming and local air quality, respectively. For many years, it has been estimated that soil-dwelling bacteria consume a significant amount of isoprene (~20 Tg C yr-1 ), but the mechanisms underlying the biological sink for isoprene have been poorly understood. Studies have indicated or confirmed the ability of diverse bacterial genera to degrade isoprene, whether by the canonical iso-type isoprene degradation pathway or through other less well-characterized mechanisms. Here, we
review current knowledge of isoprene metabolism and highlight key areas for further research. In particular, examples of isoprene-degraders that do not utilize the isoprene monooxygenase have been identified in recent years. This has fascinating implications both for the mechanism of isoprene uptake by bacteria, and also for the ecology of isoprene-degraders in the environments.