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We report on the construction and the dynamics of monodisperse star-shapedparticles, mimicking, at the mesoscale, star polymers. Such multi-arm star-likeparticles result from the self-assembly of gold nanoparticles, forming thecore, with tip-linked filamentous viruses - M13 bacteriophages - acting asspines in a sea urchin-like structure. By combining fluorescence and dark-fieldmicroscopy with dynamic light scattering, we investigate the diffusion of thesehybrid spiny particles. We reveal the internal dynamics of the star particlesby probing their central metallic core, which exhibits a hindered motion thatcan be described as a Brownian particle trapped in a harmonic potential. Wetherefore show that the filamentous viruses and specifically their tip proteinsbehave as entropic springs, extending the relevance of the study of such hybridmesoscopic analogs of star polymers to phage biotechnology.

M13-phage-based star-shaped particles with internal flexibility