Further studies on the multiple forms of protease ALP of Aspergillus fumigatus

Author: Kunert, J.

Source: Mycoses, Volume 44, Numbers 7-8, October 2001 , pp. 307-310(4)

Publisher: Wiley-Blackwell

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Abstract:

Summary.

The author studied the presence of multiple forms of the main extracellular protease ALP in three strains of Aspergillus fumigatus that differed in geographical origin, and in mutants of one of these strains with disrupted genes coding for the main proteases ALP and MEP. The pattern of multiple proteolytic bands after isoelectric focusing was, in all three wild strains, nearly the same and was not changed after inactivation of the MEP gene. However, in ALP-deficient mutants all multiple forms also disappeared. The multiple forms observed must therefore be products of post-translational processing of the protease ALP and not true isoenzymes (products of different genes of a gene family). Further experiments did not prove that phosphorylation and glycosylation were involved in the formation of the multiple forms under study.

German
Zusammenfassung.

Der Autor untersuchte die multiplen Formen der extrazellulären Protease ALP bei drei Stämmen von Aspergillus fumigatus verschiedener geographischer Herkunft und bei den Mutanten von einem der Stämme mit inaktivierten Genen für die Hauptproteasen ALP und MEP. Das Muster der proteolytischen Banden nach isoelektrischer Fokussierung war bei allen drei Stämmen fast gleich und die Inaktivierung des MEP-Gens hatte keine Veränderungen verursacht. Bei den Mutanten ohne Protease ALP verschwanden aber auch alle multiplen Formen. Diese Formen stellen deswegen die Produkte von postsynthetischen Modifikationen der ALP-Protease dar und sind keine echten Isoenzyme (Produkte verschiedener Gene einer Gen-Familie). Durch weitere Versuche konnte nicht bewiesen werden, dass Phosphorylierung oder Glykosylierung an dem Entstehen der multiplen Formen beteiligt sind.

Keywords: Aspergillus fumigatus; protease ALP; protein processing; Aspergillus fumigatus; Protease ALP; Proteinreifung

Document Type: Research article

Affiliations: 1: Institute of Biology, Faculty of Medicine, Palacký University, Olomouc, Czech Republic.

Publication date: 2001-10-01

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