RESPONSE OF THE CYANOBACTERIUM, OSCILLATORIA-TENUIS, TO LOW IRON ENVIRONMENTS - THE EFFECT ON GROWTH-RATE AND EVIDENCE FOR SIDEROPHORE PRODUCTION
RESPONSE OF THE CYANOBACTERIUM, OSCILLATORIA-TENUIS, TO LOW IRON ENVIRONMENTS - THE EFFECT ON GROWTH-RATE AND EVIDENCE FOR SIDEROPHORE PRODUCTION
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DOI：
10.1007/bf00248680
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发表时间：
1992-04-01
影响因子：
2.8
通讯作者：
TRICK, CG
中科院分区：
文献类型：
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作者：
BROWN, CM;TRICK, CG
蓝细菌在含有少量生物可用铁的培养基中生长的能力各不相同。有些菌株，例如细颤颤藻，非常适合在低铁环境中繁衍生息。我们研究了 O. tenuis 的铁清除机制，发现这种蓝藻具有铁载体介导的铁转运系统，该系统与其他蓝藻报道的传统异羟肟酸-铁载体转运系统显着不同。与其他蓝细菌不同，该菌株产生两种类型的铁载体，异羟肟酸型铁载体和儿茶酚型铁载体。这两种铁载体的产生在培养基中以两种不同的铁水平表达，表明两种不同的铁调节吸收系统。我们将每种铁载体的产生与培养物的生长速率进行比较，发现儿茶酚铁载体的产生提高了蓝藻的生长速率，而当仅产生异羟肟酸型铁载体时，细胞保持低于最大生长速率。
Cyanobacteria vary in their ability to grow in media containing low amounts of biologically available iron. Some strains, such as Oscillatoria tenuis, are well adapted to thrive in low-iron environments. We investigated the mechanism of iron scavenging in O. tenuis and found that this cyanobacterium has a siderophore-mediated iron transport system that differs significantly from the traditional hydroxamate-siderophore transport system reported from other cyanobacteria. Unlike other cyanobacteria, this strain produces two types of siderophores, a hydroxamate-type siderophore and a catechol-type siderophore. Production of these two siderophores is expressed at two different iron levels in the medium, suggesting two different iron regulated uptake systems. We compared the production of each siderophore with the growth rate of the culture and found that the production of the catechol siderophore enhances the growth rate of the cyanobacterium, whereas the cells maintain lower than maximal growth rates when only the hydroxamate-type siderophore is being produced.