A distance-weighted interaction map reveals a previously uncharacterized layer of the Bacillus subtilis spore coat.

A distance-weighted interaction map reveals a previously uncharacterized layer of the Bacillus subtilis spore coat.
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DOI:
10.1016/j.cub.2010.03.060
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发表时间:
2010-05-25
期刊:
影响因子:
9.2
通讯作者:
Eichenberger, Patrick
Eichenberger, Patrick
中科院分区:
生物学1区
文献类型:
--
作者:
McKenney, Peter T.;Driks, Adam;Eskandarian, Haig A.;Grabowski, Paul;Guberman, Jonathan;Wang, Katherine H.;Gitai, Zemer;Eichenberger, Patrick

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Bacillus subtilis spores are encased in a protein assembly called the spore coat that is made up of at least 70 different proteins. Conventional electron microscopy shows the coat to be organized into two distinct layers. Because the coat is about as wide as the theoretical limit of light microscopy, quantitatively measuring the localization of individual coat proteins within the coat is challenging. We used fusions of coat proteins to GFP to map genetic dependencies for coat assembly and define three independent sub-networks of coat proteins. To complement the genetic data, we measured coat protein localization at sub-pixel resolution and integrated these two data sets to produce a distance-weighted genetic interaction map. Using these data we predict that the coat comprises at least four spatially distinct layers, including a previously uncharacterized glycoprotein outermost layer that we name the spore crust. We found that crust assembly depends on proteins we predicted to localize to the crust. The crust may be conserved in all Bacillus spores and may play critical functions in the environment.
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