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. 2022 Feb 22;119(8):e2116871119. doi: 10.1073/pnas.2116871119

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Fig. 1. — HO-shell architectures and design of the synthetic formate and acetate utilizing BMC. (A) The HO-shell is composed of three different types of building blocks: BMC-H (blue, hexamers), BMC-T (green, trimers/pseudohexamers), and BMC-P (yellow, pentamers) proteins. In the HO-shell are three BMC-T proteins, single-layer T₁, and double-layer T₂ and T₃. (B) HO-shell without pentamers (wiffleball). Shells still form but leave 6-nm-wide vacancies for substrate and product exchange. (C) minimal HO-shell without pentamers (minimal wiffleball) containing only T₁ and not T₂ or T₃. (D) Schematic of the enzymatic reactions of the sFUT for the conversion of formate and acetate into pyruvate. PFL and a PTA need to be coencapsulated to be able to cycle CoA between them; this creates a private cofactor pool for these enzymes.