FIGURE 6.

Inter-β-subunit connections. An overlay of the β-rings from the EM and crystal structure, shown in blue and red, respectively. The β-subunits are tilted and the view is from the α-side of the 16S structure. The two connections between two β-subunits can be seen with one connection positioned closer to the α-ring. A contact is made from the end of Helix 1 to a loop region of a neighboring β-subunit. This contact lies closest to the α-ring. The second contact is located slightly higher in the β-ring, toward the edge of the 16S precursor complex structure, and extends from a loop and β-strand of the β-subunit to a loop region of the neighboring β-subunit. The scale bar represents 10 nm.