在蓝藻细菌中的肌球蛋白
M Potts1, S V Angeloni, R E Ebel
1Department of Biochemistry, Virginia Polytechnic Institute and State University, Blacksburg Va 24061.
Science (New York, N.Y.)
|June 19, 1992
概括
在Nostoc公社发现了一种新型肌球蛋白,蓝球蛋白,它是一种固的蓝球菌. 这种血蛋白与真核细胞髓质蛋白有关,在缺乏的微空气条件下出现.
科学领域:
- 生物化学 生物化学
- 微生物学 微生物学
- 分子生物学分子生物学
背景情况:
- 肌球蛋白通常在动物的肌肉组织中发现,在氧气运输和储存中发挥作用.
- 在 prokaryotes,特别是蓝藻细菌中,肌球蛋白样蛋白的存在和功能仍然不太清楚.
- 菌中的固定是一种复杂的过程,对氧气水平敏感.
研究的目的:
- 为了识别和表征固的蓝藻细菌Nostoc公社中的肌球蛋白类蛋白质.
- 为了研究这种新型的蓝藻细菌血蛋白的遗传基础和表达模式.
- 探索蓝球蛋白在固过程中氧气恒温的潜在作用.
主要方法:
- 从Nostoc公社中分离和净化血蛋白.
- 生物化学表征包括分子量确定 (12.5 kDa).
- 氨基酸测序和与已知的肌球蛋白进行比较.
- 基因鉴定 (glbN) 和基因组定位相对于固定基因 (nifU, nifH).
- 在特定的环境条件下检测蓝球蛋白表达 (饥饿,微空气化).
主要成果:
- 在Nostoc公社中发现了一种可溶性血蛋白,称为蓝球蛋白.
- 蓝球蛋白表现出与像Paramecium和Tetrahymena这样的低级真核生物中的髓球蛋白的序列同质性.
- 蓝球蛋白基因 (glbN) 位于与必需的固基因相邻.
- 球蛋白在缺乏和微空气条件下的细胞中被特别检测到.
结论:
- 诺斯托克公社拥有独特的蓝球蛋白,与真核细胞肌球蛋白有着进化联系.
- glbN基因与nif基因的近距离表明,glbN基因在固化中起着协调作用.
- 蓝球蛋白表达受的可用性和氧气水平的调节,可能有助于保护酶活性.
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