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Leptoquark models may explain deviations from the Standard Model observed indecay processes involving heavy quarks at high-energy colliders. Such modelsgive rise to low-energy parity- and time-reversal-violating phenomena in atomsand molecules. One of the leading effects among these phenomena is thenucleon-electron tensor-pseudotensor interaction when the low-energyexperimental probe uses a quantum state of an atom or molecule predominantlycharacterized by closed electron shells.  In the present paper the molecular interaction constant for thenucleon-electron tensor-pseudotensor interaction in the thallium-fluoridemolecule -- used as such a sensitive probe by the CeNTREX collaboration[Quantum Sci. Technol., 6:044007, 2021] -- is calculated employinghighly-correlated relativistic many-body theory. Accounting for up to quintupleexcitations in the wavefunction expansion the final result is $W_T({\text{Tl)}}= -6.25 \pm 0.31\, $[$10^{-13} {\langle\Sigma\rangle}_A$ a.u.] Interelectroncorrelation effects on the tensor-pseudotensor interaction are studied for thefirst time in a molecule, and a common framework for the calculation of sucheffects in atoms and molecules is presented.

${\cal{P,T}}$-Odd Weak Neutral Current Interactions in the TlF Molecule