Science

How a metabolite protects the enzyme that consumes it

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 06/11/2026, 21:55:25 UTC.

Briefings

Researchers from the MPI of Biochemistry, University of Nevada, Las Vegas, and de Duve Institute in Brussels discovered that tryptophan binds to a specific site on the enzyme TDO2, preventing it from consuming the amino acid. This binding sequesters a region required by the kinase CK2 and ubiquitin ligase CUL1–β-TrCP, which signals TDO2 degradation. The findings were published in Molecular Cell.

Key points

• Tryptophan binds to a second site on the enzyme TDO2, distinct from its consumption site.
• This binding sequesters a region needed by the kinase CK2 and ubiquitin ligase CUL1–β-TrCP to signal TDO2 degradation.

Context

Cells regulate metabolite levels to avoid excessive consumption. This study explains how tryptophan binding to TDO2 prevents its own degradation through sequential signaling by CK2 and CUL1–β-TrCP.

Limitations

Evidence is limited to the molecular mechanism described in the source article. No data on cellular outcomes, experimental conditions, or broader biological implications are provided.

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