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OEP23 exists in the entire plant lineage starting from green algae till flowering plants. It forms a cation selective single channel in the outer membrane of chloroplasts. It is a single channel and is not a member of a multiple pore complex like other bacterial or mitochondrial beta barrels. For this reason, it is considered a novel member of the ion channels in the outer membrane of chloroplasts that are responsible for solute exchange. CD spectroscopy studies revealed that OEP23 secondary structure constitutes of 42 ∓ 10% alpha-helix, 14 ∓ 5% beta-sheet, 16 ∓ 5% turns and 27 ∓ 5% of unordered structures.
Oep23 forms an ion channel in the chloroplast outer envelope
BMC Plant Biol. 2015 Feb 12;15:47. doi: 10.1186/s12870-015-0445-1.