T4 Bacteriophage clamp gp45

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The models demonstrate the closed and open forms of T4 bacteriophage DNA clamp. The "open form" occurs during loading onto DNA by a clamp loader complex. Enterobacteria phage T4 infects Escherichia coli bacteria. Each viral gp45 sliding clamp subunit protein contains two domains, with each domain comprising of two alpha helices and two beta sheets. The fold is duplicated, featuring internal pseudo two-fold symmetry. Three gp45 molecules form a closed ring encircling duplex DNA. These surface representations were derived from PDB entries 1CZD and 3U60, with STL files created using VMD. Successfully printed using a Replicator 2 with MakerWare 2.2.2.89, standard resolution, 25% infill, three shells, raft, and supports.