A new crystal form of a hyperthermophilic endocellulase
- National Institute of Advanced Industrial Science and Technology (AIST), 3-11-32 Kagamiyama, Higashi-hiroshima, Hiroshima 739-0046 (Japan)
The hyperthermostable endocellulase from P. furiosus was crystallized at pH 5.5. The new crystal form has symmetry consistent with space group C2 and exhibits a structure different from that of the protein crystallized at pH 9.0. The hyperthermophilic glycoside hydrolase family endocellulase 12 from the archaeon Pyrococcus furiosus (EGPf; Gene ID PF0854; EC 3.2.1.4) catalyzes the hydrolytic cleavage of the β-1,4-glucosidic linkage in β-glucan in lignocellulose biomass. A crystal of EGPf was previously prepared at pH 9.0 and its structure was determined at an atomic resolution of 1.07 Å. This article reports the crystallization of EGPf at the more physiologically relevant pH of 5.5. Structure determination showed that this new crystal form has the symmetry of space group C2. Two molecules of the enzyme are observed in the asymmetric unit. Crystal packing is weak at pH 5.5 owing to two flexible interfaces between symmetry-related molecules. Comparison of the EGPf structures obtained at pH 9.0 and pH 5.5 reveals a significant conformational difference at the active centre and in the surface loops. The interfaces in the vicinity of the flexible surface loops impact the quality of the EGPf crystal.
- OSTI ID:
- 22375692
- Journal Information:
- Acta crystallographica. Section F, Structural biology communications, Vol. 70, Issue Pt 7; Other Information: PMCID: PMC4089524; PMID: 25005081; PUBLISHER-ID: gx5224; OAI: oai:pubmedcentral.nih.gov:4089524; Copyright (c) Kataoka & Ishikawa 2014; This is an open-access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.; Country of input: International Atomic Energy Agency (IAEA); ISSN 2053-230X
- Country of Publication:
- United States
- Language:
- English
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