Acta Cryst. (2013). F69, 733-737 [ doi:10.1107/S174430911301614X ]
Abstract: The cellulosome of the cellulolytic bacterium Clostridium thermocellum has a structural multi-modular protein called CipA (cellulosome-integrating protein A) that includes nine enzyme-binding cohesin modules and a family 3 cellulose-binding module (CBM3a). In the CipA protein, the CBM3a module is located between the second and third cohesin modules and is connected to them via proline/threonine-rich linkers. The structure of CBM3a with portions of the C- and N-terminal flanking linker regions, CBM3a-L, has been determined to a resolution of 1.98 Å. The structure is a -sandwich with a structural Ca2+ ion. The structure is consistent with the previously determined CipA CBM structure; however, the structured linker regions provide a deeper insight into the overall cellulosome structure and assembly.
PDB reference: 4jo5
Keywords: family 3 cellulose-binding module; CipA; Clostridium thermocellum; cellulosome.
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