A regulator of Aspergillus fumigatus extracellular proteolytic activity is dispensable for virulence.

Abstract:

:Virulence of the fungal pathogen Aspergillus fumigatus is in part based on the saprophytic lifestyle that this mold has evolved. A crucial function for saprophytism resides in secreted proteases that allow assimilation of proteinaceous substrates. The impact of extracellular proteolytic activities on the pathogenesis of aspergillosis, however, remains controversial. In order to address this issue, characterization of a conserved regulatory factor, PrtT, that acts on expression of secreted proteases was pursued. Expression of PrtT appears to be regulated posttranscriptionally, and the existence of an mRNA leader sequence implies translational control via eIF2alpha kinase signaling. Phenotypic classification of a prtTDelta deletion mutant revealed that expression of several major extracellular proteases is PrtT dependent, resulting in the inability to utilize protein as a nutritional source. Certain genes encoding secreted proteases are not regulated by PrtT. Most strikingly, the deletant strain is not attenuated in virulence when tested in a leukopenic mouse model, which makes a strong case for reconsidering any impact of secreted proteases in pulmonary aspergillosis.

journal_name

Infect Immun

journal_title

Infection and immunity

authors

Bergmann A,Hartmann T,Cairns T,Bignell EM,Krappmann S

doi

10.1128/IAI.00425-09

subject

Has Abstract

pub_date

2009-09-01 00:00:00

pages

4041-50

issue

9

eissn

0019-9567

issn

1098-5522

pii

IAI.00425-09

journal_volume

77

pub_type

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