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. 2008 Sep 23;105(39):15100–15105. doi: 10.1073/pnas.0806301105

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© 2008 by The National Academy of Sciences of the USA

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Fig. 5. — Forespore-specific biotinylation of C-terminal BAP-tagged SpoIIQ. (A) Streptavidin-HRP Western blot with lysates prepared at t₃ from strains producing combinations of SpoIIQ-BAP and BirA produced in the mother cell, the forespore, or not at all. (B) Biotinyl-SpoIIQ-BAP proteolysis. Lysates prepared at t₃ (lane 1), t_3.25 (lane 2), and t_3.5 (lane 3). (C) SpoIIIAH-SpoIIQ channel model. (Left) SpoIIIAH and SpoIIQ track along the engulfing membrane and colocalize in discrete foci surrounding the forespore. (Right) The C-terminal extracellular domains of SpoIIIAH and SpoIIQ interact in the intermembrane space and form a channel that is open at the forespore end and closed (or gated) at the mother cell end.