Conditions for the extraction of protease-free LMG proteins from calf thymus.

Calf thymus LMG proteins are known to be susceptible to a wide variety of chromatin-associated proteases. We have investigated the use of different inhibitors to protect LMG chromosomal proteins from proteolytic degradation. In this work we have developed a preparative method for the extraction of LMG proteins from purified chromatin which provides an LMG protein extract devoid of proteolytic activity.