Diffusion of Integral Membrane Proteins in Protein-Rich Membranes

Matti Javanainen, Hector Martinez-Seara, Ralf Metzler, Ilpo Vattulainen

    Research output: Contribution to journalArticleScientificpeer-review

    31 Citations (Scopus)
    43 Downloads (Pure)

    Abstract

    The lateral diffusion of embedded proteins along lipid membranes in protein-poor conditions has been successfully described in terms of the Saffman-Delbrück (SD) model, which predicts that the protein diffusion coefficient D is weakly dependent on its radius R as D ∞ ln(1/R). However, instead of being protein-poor, native cell membranes are extremely crowded with proteins. On the basis of extensive molecular simulations, we here demonstrate that protein crowding of the membrane at physiological levels leads to deviations from the SD relation and to the emergence of a stronger Stokes-like dependence D ∞ 1/R. We propose that this 1/R law mainly arises due to geometrical factors: smaller proteins are able to avoid confinement effects much better than their larger counterparts. The results highlight that the lateral dynamics in the crowded setting found in native membranes is radically different from protein-poor conditions and plays a significant role in formation of functional multiprotein complexes.

    Original languageEnglish
    Pages (from-to)4308-4313
    Number of pages6
    JournalJournal of Physical Chemistry Letters
    Volume8
    Issue number17
    DOIs
    Publication statusPublished - 7 Sept 2017
    Publication typeA1 Journal article-refereed

    Publication forum classification

    • Publication forum level 3

    ASJC Scopus subject areas

    • General Materials Science

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