Structure prediction and function characterization of WC-2 proteins in Blakeslea trispora

Area of Science:

• Mycology
• Molecular Biology
• Photobiology

Background:

• Blakeslea trispora produces carotenoids, influenced by sex hormones and blue light.
• Blue light perception in fungi involves WC-1 and WC-2 proteins forming the WCC transcription factor complex.
• WC-1 and WC-2 homologs are known in related fungi like Phycomyces and Mucor.

Purpose of the Study:

• To investigate the WC-2-like gene family in Blakeslea trispora.
• To understand the role of these genes in blue light-mediated carotenoid biosynthesis.
• To elucidate the formation and structure of WC-1/WC-2 complexes in B. trispora.

Main Methods:

• Genomic identification of WC-2-like genes in B. trispora.
• Quantitative analysis of gene transcription under blue light.
• Yeast two-hybrid assays to study protein-protein interactions.
• 3D structure prediction and protein-protein docking analysis.

Main Results:

• Four WC-2-like genes (Btwc-2a, Btwc-2b, Btwc-2c, Btwc-2d) were identified in B. trispora.
• Differential transcriptional regulation of these genes upon blue light exposure.
• BtWC-2a interacts with BtWC-1a or BtWC-1c, forming distinct WCC complexes.
• Predicted 3D structures reveal structural differences between these complexes.

Conclusions:

• WC proteins in B. trispora are involved in blue light regulation through WCC complex formation.
• The interaction patterns and structural diversity of WCC complexes suggest a complex photobiology regulation mechanism.
• This study reveals a unique WC protein interaction system in B. trispora compared to other fungi.