Question: The maltose transporter maltoporin (Mr 49,913) spans the outer membrane of E. coli . It is comprised of 18 successive antiparallel ? - strands arranged like the staves of a barrel to create a channel through the membrane. Beta - turns connect the strands on the periplasmic
side of the membrane; loops connect the strands on the outer side. The N - and C - termini coincide with the ends of ? - strands and are both on the periplasmic side. Calculate the average number of residues per outside loop?