Figure 4

The X-ray crystal structure of ligand bound tmCBP. (a) Ribbon representation of the overall structure of the laminaribiose bound tmCBP. The laminaribiose ligand is shown in ball and stick representation and the calcium ion is represented as a green sphere. (b) Close-up view of the tmCBP amino acids involved in hydrogen bonding (black dashed lines) and van der Waals interaction. The laminaribiose ligand and the amino acids interacting with the ligand are shown in ball and stick representation. (c) Ribbon representation of the overall structure of the laminaripentaose bound tmCBP. The laminaripentaose ligand is shown in ball and stick representation and the calcium ion is represented as a green sphere. (d) Close-up view of the tmCBP amino acids involved in hydrogen bonding (black dashed lines) and van der Waals interaction. The laminaripentaose ligand and the amino acids interacting with the ligand are shown in ball and stick representation.