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. 2013 Mar 21;110(14):5504–5509. doi: 10.1073/pnas.1300601110

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Fig. 4. — Architecture of the turret. (A) The pentameric C381 turret protein X-ray structure is shown fit into the corresponding region of the cryoEM density. (B) Each C381 monomer is formed of three layers of jelly-rolls with markedly different orientations. (C) The interior of the C381 pentamer exhibits a positive electrostatic surface potential and several constrictions (indicated by black arrows). These characteristics are unfavorable to allow dsDNA genome transit during packaging or infection. Electrostatics calculations were carried out at pH 3.0 and 80 °C, and the result is displayed colored from red (−5 kT/e) to blue (+5 kT/e). One C381 monomer has been removed to allow visualization of the pentamer central cavities.