在零度以下的环境中化学自和适应寒冷的Rubisco的潜力
Kaitlin Harrison1,2, Josephine Z Rapp3, Alexander L Jaffe4
1School of Oceanography, University of Washington, Seattle, Washington, USA.
Applied and environmental microbiology
|May 30, 2025
概括
我们在北极盐水和海冰中发现了各种自营养途径和Rubisco酶. 来自Thiomicrorhabdus的冷适应的Rubisco形式II显示出在极端环境中具有独特的动力学和热稳定性的潜力.
科学领域:
- 微生物学 微生物学
- 天体生物学 天体生物学
- 生物化学 生化学
背景情况:
- 无机碳的固定,对地球上的生命至关重要,鲁比斯科是关键的酶.
- 虽然植物和蓝藻细菌得到了很好的研究,但在极端环境中的细菌也利用鲁比斯科进行化学和自otrophy.
- 北极的冷盐水和海冰代表着独特的,低于零度的,高度的环境,庇护着多样化的微生物生物.
研究的目的:
- 在北极零度以下,高盐环境中描述自营养途径和鲁比斯科多样性.
- 从这些环境中调查Thiomicrorhabdus属中的Rubisco的丰富性和形式.
- 模拟鲁比斯科的动力学,并评估在极端环境下潜在的寒冷适应性.
主要方法:
- 从北极样本进行基因组组装基因组 (MAG) 重建.
- 在各种环境中对Thiomicrorhabdus进行基因组调查.
- 在不同条件下 (CO2,O2,温度) 的Rubisco碳氧化率的动力建模.
主要成果:
- 卡尔文-本森-巴什姆 (CBB) 循环是普遍存在的,不同的鲁比斯科形式主导着每个环境.
- 确定了四种具有化学性和自营性潜力的MAG,其中Thiomicrorhabdus是最丰富的.
- 鲁比斯科形式II,主要存在于零度以下的环境中,显示出适应寒冷的潜力,具有更暴露的活性部位,超过了低O2的形式I.
结论:
- 来自Thiomicrorhabdus的Subzero Rubisco形式II需要进一步研究独特的动力学和热稳定性.
- 这项研究扩大了对极端地球环境中的自营养功能极限的理解.
- 这些发现对识别其他行星天体 (如恒星,欧罗巴和火星) 潜在的自变有意义.
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