It's raining, it's porin: Fragment ligation of OmpF ion channels was achieved by using the split Psp-GBD Pol intein; this allowed reconstitution of active trimeric porin. In combination with cysteine modification at an internal position, the porin's conductance properties were altered.
The attachment of modulators to a trimeric porin ion channel was investigated (see picture of the trimer with a crown ether modulator (orange)). The interplay of modulator and protein is essential for the conformational heterogeneity of the hybrid channel. Single-site attachment in large pores is not sufficient to change the electrophysiological characteristics of the pores-such change requires additional noncovalent interactions or second-site attachments.
Die Anknüpfung von Modulatoren an einen trimeren Porin‐Ionenkanal wurde untersucht (Bild: Trimer mit einem Kronenethermodulator (orange)). Entscheidend für die konformative Heterogenität des hybriden Kanals ist das Zusammenspiel von Modulator und Protein. Ein‐Punkt‐Anknüpfungen in großen Poren reichen wohl nicht für eine Änderung seiner elektrophysiologischen Eigenschaften aus – dies erfordert zusätzliche nichtkovalente Wechselwirkungen oder Zwei‐Punkt‐Anknüpfungen.magnified image
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