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Folding and unfolding of biopolymers are often manipulated in experiment bytuning pH, temperature, single-molecule force or shear field. Here we carry outBrownian dynamics simulations to explore the behavior of a singleself-attracting chain in the suspension of self-propelling particles (SPPs). Asthe propelling force increases, globule-stretch (G-S) transition of the chainhappens due to the enhanced disturbance from SPPs. Two distinct mechanisms ofthe transition in the limits of low and high rotational diffusion rates of SPPshave been observed: shear effect at low rate and collision-induced melting athigh rate. The G-S and S-G (stretch-globule) curves form hysteresis loop at lowrate, while they merge at high rate. Besides, we find two competing effectsresult in the non-monotonic dependence of the G-S transition on the SPP densityat low rate. Our results suggest an alternative approach to manipulating thefolding and unfolding of (bio)polymers by utilizing active agents.

Transition between globule and stretch states of a self-attracting chain in the repulsive active particle bath