Streptomyces Avidinii

Streptomyces Avidinii is a bacterium species from the genus of Streptomyces which produces streptavidin. It is often from the hen egg-white protein, avidin, which has high affinity to biotin. Its homologous core shares 33% sequence similarity with avidin, as well as sharing a common tetrameric structure. It is a crystalline tetrameric protein, with a molecular weight of 15000Da. It binds four molecules of biotin. Streptavidin lacks carbohydrate and sulfur-containing amino acids. Streptavidin is a crystalline protein isolated from its bacterium and possesses biotin-binding ability. It has four binding sites for biotin like avidin and binds four molecules of biotin. Streptavidin is now considered as a new type of biotin-binding protein.

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