Fig. 2: Structure and interfaces of the symmetry-mismatched neck.
From: Structure of the intact tail machine of Anabaena myophage A-1(L)
a Cartoon representation of the neck, containing the pentadecameric gp5 (green), the hexameric gp7 (gold), and five trimeric gp82N of neck fibers (pink), except for the dodecameric portal. The terminator gp8, which is responsible for the docking of tail to the neck, is also shown in blue. The gray densities indicate the unmodelled parts of the neck fibers. The gp5-gp7 (b) and gp5-gp82N (c) complexes seen from the head., Paired interfaces of gp5-gp7 (d), gp5-gp82N (e), and gp7-gp8 (f) in magnified views. The secondary structure elements involved in the interactions are labeled. The residue numbers are as follows: Loopα4-α5 (residues Ile83-Tyr99) and Loopα1-α2 (residues Leu20-Glu30) of gp5; α1 (residues Met1-Leu25), Loopβ4-β5 (residues Gly55-Thr65) and β4′-β5′ (residues Asn52-Gly55, Ile66-Ala68) of gp7; Loopβ5-β6 of gp82N (residues Thr70-Lys75); Loopα1-β1 (residues Ile15-Val34) and Loopβ5-β6 (residues Leu135-Trp152) of gp8.
