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Updated: Jun 27, 2026

Inducible and Reversible Dominant-negative (DN) Protein Inhibition
Published on: January 7, 2019
Dominant negative Tax double mutants as molecular inhibitors for w.t. Tax gene functions
Mahmoud Egbaria1, Yulia Tabakin-Fix, Mahmoud Huleihel
1Department of Virology and Developmental Genetics, Faculty of Health Sciences, Ben Gurion University of the Negev, Beer Sheva 84105, Israel.
Abstract:
Tax plays a key role in HTLV-1 pathogenicity, partly due to its capacity of constitutive NF-kappaB activation. Delta58Tax does not translocate to the nucleus and traps w.t. Tax molecules in the cytoplasm but still retains the cytoplasmic NF-kappaB activation ability. Therefore, it enhances the w.t. Tax activation of NF-kappaB when co-expressed at lower level than w.t. Tax. However, the double mutants Delta58Tax (M22) and Delta58Tax (148) are defective also in the cytoplasmic NF-kappaB activation. They were found as capable of blocking the w.t. Tax-induced NF-kappaB-dependent activation even when expressed at low levels. These double mutants may, therefore, be used as powerful tools for blocking w.t. Tax functions.
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