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. 2013 Jan 24;3(1):118–130. doi: 10.3390/life3010118

Figure 3.

Figure 3

A conserved 4-helix bundle arrangement found in archaeal viruses from Lipothrixviridae and Rudiviridae. The two structural proteins from AFV1, orf132 (PDB ID 3FBL [25]) and orf140 (PDB ID 3FBZ [25]) adopt the same 4 α-helix bundle arrangements as the C-terminal domain of the single coat protein from SIRV-YNP (PDB ID 3F2E [30]). It is noteworthy that the first 50 amino acids from AFV1 orf132 are absent from the x-ray data. The N-terminal and C-terminal ends of each protein structure are labeled with “N” and “C”, respectively. The α-helices are labeled for SIRV-YNP CP and follow the same arrangement in the other two protein structures.