• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nature >Metabolic streamlining in an open-ocean nitrogen-fixing cyanobacterium
【24h】

Metabolic streamlining in an open-ocean nitrogen-fixing cyanobacterium

机译：开放海洋固氮蓝细菌中的代谢精简

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Nitrogen (N_2)-fixing marine cyanobacteria are an important source of fixed inorganic nitrogen that supports oceanic primary productivity and carbon dioxide removal from the atmosphere. A globally distributed, periodically abundant N_2-fixing marine cyanobacterium, UCYN-A, was recently found to lack the oxygen-producing photosystem II complex of the photosynthetic apparatus, indicating a novel metabolism, but remains uncultivated. Here we show, from metabolic reconstructions inferred from the assembly of the complete UCYN-A genome using massively parallel pyro-sequencing of paired-end reads, that UCYN-A has a photofermenta-tive metabolism and is dependent on other organisms for essential compounds. We found that UCYN-A lacks a number of major metabolic pathways including the tricarboxylic acid cycle, but retains sufficient electron transport capacity to generate energy and reducing power from light. Unexpectedly, UCYN-A has a reduced genome (1.44 megabases) that is structurally similar to many chlo-roplasts and some bacteria, in that it contains inverted repeats of ribosomal RNA operons. The lack of biosynthetic pathways for several amino acids and purines suggests that this organism depends on other organisms, either in close association or in symbiosis, for critical nutrients. However, size fractionation experiments using natural populations have so far not provided evidence of a symbiotic association with another microorganism. The UCYN-A cyanobacterium is a paradox in evolution and adaptation to the marine environment, and is an example of the tight metabolic coupling between microorganisms in oligotrophic oceanic microbial communities.
机译：固定氮（N_2）的海洋蓝细菌是固定的无机氮的重要来源，可支持海洋的初级生产力和从大气中去除二氧化碳。最近发现，分布在全球的定期固定N_2的海洋蓝细菌UCYN-A缺乏光合装置的产氧光系统II复合物，表明新陈代谢，但仍未培养。在这里，我们从配对末端读数的大规模并行热解测序从完整UCYN-A基因组的组装推断出的代谢重建中，表明UCYN-A具有光发酵代谢，并且依赖于其他生物体作为必需化合物。我们发现UCYN-A缺乏许多主要的代谢途径，包括三羧酸循环，但保留了足够的电子传输能力以产生能量并降低光能。出乎意料的是，UCYN-A的基因组减少（1.44兆碱基），与许多叶绿体和某些细菌在结构上相似，因为它含有核糖体RNA操纵子的反向重复序列。几种氨基酸和嘌呤缺乏生物合成途径，表明该生物依赖其他生物，无论是紧密结合还是共生，都需要关键的养分。但是，迄今为止，使用自然种群进行的大小分级实验还没有提供与另一种微生物共生关联的证据。 UCYN-A蓝细菌是进化和适应海洋环境的悖论，并且是贫营养海洋微生物群落中微生物之间紧密代谢耦合的一个例子。

著录项

  • 来源
    《Nature》 |2010年第7285期|90-94|共5页
  • 作者

    H. James Tripp; Shellie R. Bench; Kendra A. Turk; Rachel A. Foster; Brian A. Desany; Faheem Niazi; Jason P. Affourtit; Jonathan P. Zehr;

  • 作者单位

    Ocean Sciences Department, University of California, Santa Cruz, 1156 High Street, Santa Cruz, California 95064, USA;

    Ocean Sciences Department, University of California, Santa Cruz, 1156 High Street, Santa Cruz, California 95064, USA;

    Ocean Sciences Department, University of California, Santa Cruz, 1156 High Street, Santa Cruz, California 95064, USA;

    Ocean Sciences Department, University of California, Santa Cruz, 1156 High Street, Santa Cruz, California 95064, USA;

    454 Life Sciences, a Roche Company, 20 Commercial Street, Branford, Connecticut 06405, USA;

    454 Life Sciences, a Roche Company, 20 Commercial Street, Branford, Connecticut 06405, USA;

    454 Life Sciences, a Roche Company, 20 Commercial Street, Branford, Connecticut 06405, USA;

    Ocean Sciences Department, University of California, Santa Cruz, 1156 High Street, Santa Cruz, California 95064, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号