The long tail fibers of bacteriophage T4 consist of rigid proximal and distal parts, connected by a hinge region. The proximal half- fiber is formed by a parallel homo-trimer of the Long-tail fiber proximal subunit Gp34. This entry represents the C-terminal domain, which forms a long triple beta-helix made up of parallel beta-strands [1,2].

1: Crystal Structure of the Carboxy-Terminal Region of the Bacteriophage T4 Proximal Long Tail Fiber Protein Gp34. Granell M, Namura M, Alvira S, Kanamaru S, van Raaij MJ; Viruses. 2017; [Epub ahead of print] PMID:28665339

2: Phage tail fibre assembly proteins employ a modular structure to drive the correct folding of diverse fibres. North OI, Sakai K, Yamashita E, Nakagawa A, Iwazaki T, Buttner CR, Takeda S, Davidson AR; Nat Microbiol. 2019;4:1645-1653. PMID:31209305