Effects of macromolecular crowding on the collapse of biopolymers

Experiments show that macromolecular crowding modestly reduces the size of intrinsically disordered proteins even at a volume fraction (ϕ) similar to that in the cytosol, whereas DNA undergoes a coil-to-globule transition at very small ϕ. We show using a combination of scaling arguments and simulati...

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Veröffentlicht in:Physical review letters 2015-02, Vol.114 (6), p.068303-068303, Article 068303
Hauptverfasser: Kang, Hongsuk, Pincus, Philip A, Hyeon, Changbong, Thirumalai, D
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Sprache:eng
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Zusammenfassung:Experiments show that macromolecular crowding modestly reduces the size of intrinsically disordered proteins even at a volume fraction (ϕ) similar to that in the cytosol, whereas DNA undergoes a coil-to-globule transition at very small ϕ. We show using a combination of scaling arguments and simulations that the polymer size R̅(g)(ϕ) depends on x=R̅(g)(0)/D, where D is the ϕ-dependent distance between the crowders. If x≲O(1), there is only a small decrease in R̅(g)(ϕ) as ϕ increases. When x≫O(1), a cooperative coil-to-globule transition is induced. Our theory quantitatively explains a number of experiments.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.114.068303