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Topological models of TprC, TprI, and TprF. (A) Comparison of domain architectures. (B) TprC/D and TprI are proposed to consist of trimers with identical β-barrels and N-terminal periplasmic domains that directly or indirectly tether the barrels to the peptidoglycan (PG) sacculus. TprF is entirely periplasmic. TprCSp is depicted as periplasmic based on its solubility in aqueous buffer. TprI shares with TprF a putative periplasmic fragment not present in TprC.
