Avidin

new avidin

Avidin is a protein present in hen egg white and tissues of birds. In hens, it is synthesized in the oviduct and then deposited in the albumin where it protects chicken embryos from disease-causing organisms that require Biotin (vitamin H) to grow.

It is a basic tetrameric glycoprotein with four identical subunits having a combined molecular weight of 67 kDa.2 – 64 kDa.3 if calculated from aminoacid composition – and an isoelectric point of approx 10.51. The monomer Avidin contains 128 aminoacid residues.

Avidin is a remarkably stable protein. Its heat denaturation gives a transition temperature of 85