4d5u
Structure of OmpF in I2Structure of OmpF in I2
Structural highlights
FunctionOMPF_ECOLI Forms pores that allow passive diffusion of small molecules across the outer membrane. It is also a receptor for the bacteriophage T2.[1] Publication Abstract from PubMedMacromolecule crystal formation can be divided in two major steps: 1. the formation of a nucleus and 2. the growth of this nucleus into a full mature crystal. The latter is well described and understood, while the former remains elusive due to the difficulty to study it and is described by nucleation theories. Here we report the structure of the Escherichiacoli outer membrane porin OmpF in two centered monoclinic space groups. Strikingly, the two crystals originate from the same building block, made of two trimers of OmpF interacting via their rough side. The different crystallization conditions trigger the formation of distinct arrangement of these building blocks, leading to the formation of translational non-crystallographic symmetry (tNCS) in one case, made possible by the loose lateral packing mediated by detergents. In light of nucleation theories, these results allow us to speculate that these two crystals originate from nuclei made of either clusters of building blocks, or already forming columns that later associate laterally using detergents as glue. Two different centered monoclinic crystals of the E. coli outer-membrane protein OmpF originate from the same building block.,Chaptal V, Kilburg A, Flot D, Wiseman B, Aghajari N, Jault JM, Falson P Biochim Biophys Acta. 2015 Nov 24. pii: S0005-2736(15)00393-4. doi:, 10.1016/j.bbamem.2015.11.021. PMID:26620074[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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