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首页> 外文期刊>Polar biology >Ferredoxin And Flavodoxin In Eastern Antarctica Pack Ice
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Ferredoxin And Flavodoxin In Eastern Antarctica Pack Ice

机译：南极东部冰块中的铁氧还蛋白和黄酮毒素

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摘要

The presence, concentration and distribution of the iron regulated proteins, ferredoxin and flavodoxin. was investigated in pack ice off eastern Antarctica using SDS-PAGE gels. Bands corresponding to ferredoxin and/or flavodoxin were observed in all but eight of the 102 core sections analysed. Flavodoxin was found in most of the ice samples and was strongly correlated with chlorophyll a standing stock. The widespread distribution of flavodoxin here is not thought to indicate iron-limitation as many of the dominant species, such as Fragilariopsis cylindrus, Cylindrotheca closterium, are known to produce this protein under iron-replete conditions and thus the significant correlation between flavodoxin and biomass is likely to be the result of widespread constitutive flavodoxin expression among the diatoms that commonly inhabit sea ice. High concentrations of ferredoxin were predominantly derived from core sections on the floes closest to the continent and also in the upper portion of these floes. There was a consistent lack of ferredoxin expression in the high biomass bottom communities. The absence of ferredoxin is likely to indicate a reduced supply of iron but the significance of this reduced iron supply cannot be inferred on the basis of protein expression alone. Furthermore, in the present study the observed variability in the flavodoxin:ferredoxin ratio may not simply reflect the iron nutritional status of the community, but probably results from changes in the abundance of species capable of expressing ferredoxin.
机译：铁调节蛋白，铁氧还蛋白和黄酮毒素的存在，浓度和分布。使用SDS-PAGE凝胶在南极东部沿海冰袋中进行了研究。在分析的102个核心切片中，除8个以外的所有切片均观察到了与铁氧还蛋白和/或黄酮毒素相对应的条带。在大多数冰样中都发现了黄素毒素，并且与叶绿素（一种常备品）密切相关。黄酮毒素的广泛分布不认为是铁限制，因为已知许多优势种，例如Fragilariopsis cylindrus，Cylindrotheca closterium，在铁充足的条件下都会产生这种蛋白质，因此黄酮毒素与生物量之间的显着相关性是这很可能是通常栖息在海冰中的硅藻中广泛的组成型黄素毒素表达的结果。高浓度的铁氧还蛋白主要来自最靠近该大陆的絮凝物以及这些絮凝物的上部的核心部分。在高生物量底部群落中始终缺乏铁氧还蛋白表达。铁氧还蛋白的缺乏可能表明铁的供应减少，但是不能仅凭蛋白质表达来推断铁供应减少的重要性。此外，在本研究中，所观察到的黄素毒素：铁氧还蛋白比例的变化可能不仅反映了该社区的铁营养状况，而且可能是由于能够表达铁氧还蛋白的物种数量的变化所致。

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