Author:

P.J. Punt, A. Drint-Kuijvenhoven, B.C. Lokmana, J.A. Spencer, D. Jeenes, D.A. Archer, C.A.M.J.J. van den Hondel

Date: 1 December 2003

Abstract:

We have characterized growth and protein processing characteristics of Aspergillus niger strains carrying a disrupted allele of the previously cloned and characterized kexB gene [Appl. Environ. Microbiol. 66 (2000) 363] encoding a furin-type endoprotease. Deletion of the single-copy gene confirms it to be non-essential but disruptant strains exhibit a morphologically distinct phenotype characterized by hyperbranching. Processing of homologous pro-proteins and fusion proteins comprised of a heterologous protein fused down-stream of glucoamylase and separated at the fusion junction by an endoproteolytic cleavage site was compared in wildtype and mutant strains of A. niger.We showthat maturation of the native glucoamylase requiresKexB, whereas maturation of aspergillopepsin does not. The processing of fusion proteins carrying Lys-Arg requiresKexB, although alternative endoproteases are capable of cleaving protein fusions at sites adjacent to Lys-Arg.

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