NDLI: Identification of Genes Associated with Morphology in Aspergillus niger by Using Suppression Subtractive Hybridization

Content Provider	PubMed Central
Author	Dai, Ziyu Mao, Xingxue Magnuson, Jon K. Lasure, Linda L.
Copyright Year	2004
Abstract	The morphology of citric acid production strains of Aspergillus niger is sensitive to a variety of factors, including the concentration of manganese (Mn2+). Upon increasing the Mn2+ concentration in A. niger (ATCC 11414) cultures to 14 ppb or higher, the morphology switches from pelleted to filamentous, accompanied by a rapid decline in citric acid production. The molecular mechanisms through which Mn2+ exerts effects on morphology and citric acid production in A. niger cultures have not been well defined, but our use of suppression subtractive hybridization has identified 22 genes responsive to Mn2+. Fifteen genes were differentially expressed when A. niger was grown in media containing 1,000 ppb of Mn2+ (filamentous form), and seven genes were expressed in 10 ppb of Mn2+ (pelleted form). Of the 15 filament-associated genes, seven are novel and eight share 47 to 100% identity with genes from other organisms. Five of the pellet-associated genes are novel, and the other two genes encode a pepsin-type protease and polyubiquitin. All 10 genes with deduced functions are either involved in amino acid metabolism-protein catabolism or cell regulatory processes. Northern blot analysis showed that the transcripts of all 22 genes were rapidly enhanced or suppressed by Mn2+. Steady-state mRNA levels of six selected filament-associated genes remained high during 5 days of culture in a filamentous state and remained low under pelleted growth conditions. The opposite behavior was observed for four selected pellet-associated genes. The full-length cDNA of the filament-associated clone, Brsa-25, was isolated. Antisense expression of Brsa-25 permitted pelleted growth and increased citrate production at concentrations of Mn2+ that were higher than the parent strain could tolerate. These results suggest the involvement of the newly isolated genes in the regulation of A. niger morphology.
Related Links	http://dx.doi.org/10.1128/aem.70.4.2474-2485.2004
Ending Page	2485
Page Count	12
Starting Page	2474
File Format	PDF
ISSN	00992240
e-ISSN	10985336
Journal	Applied and Environmental Microbiology
Issue Number	4
Volume Number	70
Language	English
Publisher	American Society for Microbiology
Publisher Date	2004-04-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Biotechnology Food Science Ecology Applied Microbiology and Biotechnology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Ecology Food Science Applied Microbiology and Biotechnology Biotechnology

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