Analysis of nucleic acid binding by a recombinant translin-trax complex

Area of Science:

• Molecular Biology
• Biochemistry
• Genetics

Background:

• Translin is a conserved RNA and DNA-binding protein crucial for DNA recombination and RNA trafficking.
• Existing crystal structures lack detail on nucleic acid recognition.
• Translin-associated factor x (trax) is hypothesized to modulate translin's binding properties and localization.

Purpose of the Study:

• To comparatively analyze the nucleic acid binding preferences of recombinant translin and the translin-trax complex.
• To elucidate the regulatory role of trax in translin's binding affinities.

Main Methods:

• Recombinant expression and purification of translin and the translin-trax complex.
• Electrophoretic mobility shift assays (EMSAs) or similar techniques to assess binding to specific RNA and DNA sequences.
• Determination of binding affinities (K(d) values) for various nucleic acid targets.

Main Results:

• Translin exhibits preferential binding to Guanine-rich (G-rich) RNA sequences.
• The translin-trax complex demonstrates a preference for G-rich DNA sequences.
• Translin binds mRNA with sub-micromolar dissociation constants (K(d)).
• The translin-trax complex binds G-rich DNA with comparable affinity.

Conclusions:

• Trax functions as a regulator of translin's affinity for both RNA and DNA.
• This regulation is integral to the cellular mechanism of RNA trafficking.
• The findings provide insights into the functional interplay between translin and trax in nucleic acid binding.