Albumin secreted from yeast having reduced levels of aspartyl protease 3 proteolytic activity, and Yap3p-resistant albumin

摘要

PCT No. PCT/GB95/00434 Sec. 371 Date Nov. 11, 1996 Sec. 102(e) Date Nov. 11, 1996 PCT Filed Mar. 1, 1995 PCT Pub. No. WO95/23857 PCT Pub. Date Sep. 8, 1995Albumin, for example human albumin, is expressed and secreted in yeast which has been mutated to lack the yeast aspartyl protease 3 (Yap3p) or its equivalent, thereby reducing the production of a 45 kD albumin fragment. A further reduction is achieved by additionally deleting the Kex2p function. Alternatively, a modified albumin is prepared which is not susceptible to Yap3p cleavage, for example human albumin which is R410A, K413Q and K414Q.