Perchlorate-Coupled Carbon Monoxide (CO) Oxidation: Evidence for a Plausible Microbe-Mediated Reaction in Martian Brines.
Perchlorate-Coupled Carbon Monoxide (CO) Oxidation: Evidence for a Plausible Microbe-Mediated Reaction in Martian Brines.
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DOI：
10.3389/fmicb.2017.02571
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发表时间：
2017
影响因子：
5.2
通讯作者：
King GM
中科院分区：
文献类型：
--
作者：
Myers MR;King GM
火星上水合盐的存在表明，如果有合适的代谢底物，火星表面的某些区域可能是宜居的。然而，有几条证据表明，火星的风化层中只含有支持异养微生物所需的微量有机物。由于有机碳的稀缺，浓度约为百万分之700的一氧化碳(CO)可能是支持近地表细菌活动的最丰富的、最容易获得的底物。尽管各种电子受体可以偶联到CO氧化，但高氯酸盐可能是火星卤水中最丰富的潜在氧化剂。高氯酸盐，一种强有力的共沸物，是否可以支持微生物的一氧化碳氧化，以前还没有文献记载。我们在这里报告了第一个证据，高氯酸盐偶联的一氧化碳氧化的基础上与两个不同的极端嗜盐真毛虫的化验。在高氯酸盐浓度为0.01~1M的3.8M氯化钠盐水中，两株菌株都能在厌氧条件下将CO与高氯酸盐或氯酸盐偶联，并在有或没有硝酸盐的情况下诱导硝酸还原酶，在极端嗜盐菌中作为高氯酸盐还原酶。在高氯酸盐存在的情况下，CO浓度被降低到远低于火星大气中的水平。这表明，如果水的活动是适当允许的，CO可能有助于水合盐层或卤水中微生物种群的生存。
The presence of hydrated salts on Mars indicates that some regions of its surface might be habitable if suitable metabolizable substrates are available. However, several lines of evidence have shown that Mars’ regolith contains only trace levels of the organic matter needed to support heterotrophic microbes. Due to the scarcity of organic carbon, carbon monoxide (CO) at a concentration of about 700 parts per million (about 0.4 Pa) might be the single most abundant readily available substrate that could support near-surface bacterial activity. Although a variety of electron acceptors can be coupled to CO oxidation, perchlorate is likely the most abundant potential oxidant in Mars’ brines. Whether perchlorate, a potent chaotrope, can support microbial CO oxidation has not been previously documented. We report here the first evidence for perchlorate-coupled CO oxidation based on assays with two distinct euryarchaeal extreme halophiles. CO oxidation occurred readily in 3.8 M NaCl brines with perchlorate concentrations from 0.01 to 1 M. Both isolates were able to couple CO with perchlorate or chlorate under anaerobic conditions with or without nitrate as an inducer for nitrate reductase, which serves as a perchlorate reductase in extreme halophiles. In the presence of perchlorate, CO concentrations were reduced to levels well below those found in Mars’ atmosphere. This indicates that CO could contribute to the survival of microbial populations in hydrated salt formations or brines if water activities are suitably permissive.
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影响因子：
3.2
作者：
Kounaves, Samuel P.;Carrier, Brandi L.;Claire, Mark W.
通讯作者：
Claire, Mark W.
DOI：
10.1002/2014je004737
发表时间：
2015-03
期刊：
Journal of geophysical research. Planets
影响因子：
--
作者：
Freissinet C;Glavin DP;Mahaffy PR;Miller KE;Eigenbrode JL;Summons RE;Brunner AE;Buch A;Szopa C;Archer PD;Franz HB;Atreya SK;Brinckerhoff WB;Cabane M;Coll P;Conrad PG;Des Marais DJ;Dworkin JP;Fairén AG;François P;Grotzinger JP;Kashyap S;Ten Kate IL;Leshin LA;Malespin CA;Martin MG;Martin-Torres FJ;McAdam AC;Ming DW;Navarro-González R;Pavlov AA;Prats BD;Squyres SW;Steele A;Stern JC;Sumner DY;Sutter B;Zorzano MP
通讯作者：
Zorzano MP
影响因子：
1.7
作者：
Al Soudi, Amer F.;Farhat, Omar;Schneegurt, Mark A.
通讯作者：
Schneegurt, Mark A.
影响因子：
56.9
作者：
Mahaffy, Paul R.;Webster, Christopher R.;Trainer, Melissa
通讯作者：
Trainer, Melissa
DOI：
10.1039/d3ta00655g
发表时间：
--
期刊：
Journal of Materials Chemistry A
影响因子：
9.5
作者：
Zhongheng Wang; Hui Xu; Zhiruo Liu; Mingzhe Jin; Linghao Deng; Sa Li; Yunhui Huang
通讯作者：
Zhongheng Wang