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Related Experiment Videos

Repressor-AFLR interaction modulates aflatoxin biosynthesis in Aspergillus parasiticus.

P K Chang1, J Yu, D Bhatnagar

  • 1Southern Regional Research Center, U.S. Department of Agriculture, New Orleans, Louisiana 70124, USA. pkchang@nola.srrc.usda.gov

Mycopathologia
|September 1, 2000
PubMed
Summary

The carboxyl region of aflatoxin regulator AFLR (AFLRC) may interact with a repressor protein, modulating aflatoxin biosynthesis. This interaction influences both AF production and sclerotial development in Aspergillus parasiticus.

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Area of Science:

  • Mycology
  • Molecular Biology
  • Biochemistry

Background:

  • Aflatoxin (AF) biosynthesis is regulated by complex interactions of positive and negative factors.
  • The AF pathway-specific regulatory gene, aflR, encodes the transcription factor AFLR, which controls AF gene expression.
  • The role of the AFLR carboxyl region (AFLRC) in protein interactions and AF regulation is not fully understood.

Purpose of the Study:

  • To investigate whether the AFLR carboxyl region interacts with proteins that positively or negatively regulate AF biosynthesis.
  • To determine the effect of AFLRC expression on AF precursor production and sclerotial development.

Main Methods:

  • The Aspergillus parasiticus aflR carboxyl coding region (aflRC) was fused to the promoter of the nitrite reductase gene (niiA(p)::aflRC).

Related Experiment Videos

  • This construct was transformed into A. parasiticus SRRC 2043.
  • The expression of niiA(p)::aflRC and its effect on AF precursor production and sclerotial development were analyzed in transformants with varying copy numbers of the integrated construct.

    • Main Results:

    • Transformants with two copies of niiA(p)::aflRC overproduced AF precursors independently of the nitrogen source.
    • Increased copy number of niiA(p)::aflRC correlated with higher AF precursor production and increased expression of both aflRC and native aflR.
    • The expressed AFLRC, lacking a DNA-binding domain, likely titrates a repressor protein that interacts with AFLR.

    Conclusions:

    • The AFLR carboxyl region (AFLRC) appears to interact with a putative repressor, modulating AF biosynthesis.
    • This interaction indirectly influences sclerotial development.
    • The findings provide new insights into the complex regulatory mechanisms of aflatoxin production.