Streptavidin is not the abandoned protein able of bounden to biotin with top affinity. Avidin is the added a lot of notable biotin-binding protein.
It has a academy amore for biotin (Kd ~ 10?15M) but in adverse to streptavidin, it is glycosylated, actually charged, has pseudo-catalytic activity (it can enhance the acid hydrolysis of an ester band amidst biotin and a nitrophenyl group) and has a academy addiction for aggregation.
Streptavidin has a agilely absinthian isoelectric point (pI) of ~5, but a recombinant analysis of streptavidin with a near-neutral pI is aswell commercially available.
more about: Streptavidin
from: Amino Acids
