The only protein structure known to span a biological membrane, other than $\beta$ helix, is the $\beta$barrel, formed by the folding of $\beta$ sheets into a barrel-like structure. Why does the presence of $\beta$ barrel proteins in the outer membrane of chloroplasts and mitochondria make lipid bilayers permeable to small molecules and ions?

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The Answer of The only protein structure known to span a biological membrane, other than $\beta$ helix, is the $\beta$barrel, formed by the folding of $\beta$ sheets into a barrel-like structure. Why does the presence of $\beta$ barrel proteins in the outer membrane of chloroplasts and mitochondria make lipid bilayers permeable to small molecules and ions?

The Only Protein Structure Known to Span a Biological Membrane β\betaβ

The Only Protein Structure Known to Span a Biological Membrane $\beta$