Department of Plant Physiology, University of Rostock, Rostock, Germany.
FEBS Lett. 2011 Dec 15;585(24):3843-9. doi: 10.1016/j.febslet.2011.10.036. Epub 2011 Oct 25.
Plant hemoglobins constitute a diverse group of hemeproteins and evolutionarily belong to three different classes. Class 1 hemoglobins possess an extremely high affinity to oxygen and their main function consists in scavenging of nitric oxide (NO) at very low oxygen levels. Class 2 hemoglobins have a lower oxygen affinity and they facilitate oxygen supply to developing tissues. Symbiotic hemoglobins in nodules have mostly evolved from class 2 hemoglobins. Class 3 hemoglobins are truncated and represent a clade with a very low similarity to class 1 and 2 hemoglobins. They may regulate oxygen delivery at high O(2) concentrations. Depending on their physical properties, hemoglobins belong either to hexacoordinate non-symbiotic or pentacoordinate symbiotic groups. Plant hemoglobins are plausible targets for improving resistance to multiple stresses.
植物血红蛋白属于一类多样化的血红素蛋白，在进化上可分为 3 个不同的类。第 1 类血红蛋白对氧气具有极高的亲和力，其主要功能是在极低的氧气水平下清除一氧化氮 (NO)。第 2 类血红蛋白对氧气的亲和力较低，它们有助于向发育中的组织供氧。根瘤中的共生血红蛋白大多是由第 2 类血红蛋白进化而来。第 3 类血红蛋白是截短的，与第 1 类和第 2 类血红蛋白的相似度非常低，形成一个分支。它们可能在高氧浓度下调节氧气输送。根据其物理性质，血红蛋白属于六配位非共生或五配位共生群。植物血红蛋白是提高对多种胁迫抗性的有希望的靶点。
