Background:The Snf1/AMPK and PKA pathways are crucial for nutrient sensing and utilization in yeast. Results: A novel cross-talk mechanism between Snf1/AMPK and PKA is proposed. Conclusion: Snf1 and Cyr1 interact in a nutrient-independent manner. Active Snf1 phosphorylates Cyr1 and negatively regulates cAMP content and PKA-dependent transcription. Significance: This is the first evidence of regulation of PKA pathway by Snf1/AMPK.
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