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A number of positively charged polypeptides and proteins bundle DNA, F-actin, microtubules, and viruses such as filamentous phage fd and tobacco mosaic virus (TMV), as well as intermediate filaments formed by vimentin. The general behavior is dictated by the common polyelectrolyte nature of these biopolymers, which gives rise to nonspecific binding by ligands carrying several net opposite charges. An attractive interaction accounts for the subsequent lateral aggregation, distinguishing thisdoi:10.1021/bi9711386 pmid:9376366 fatcat:2iuu3egao5bnrosdgtbsksrbg4