The hypothetical protein P47 of Clostridium botulinum E1 strain Beluga has a structural topology similar to bactericidal/permeability-increasing protein
- Univ. of California, Irvine, CA (United States)
- Medizinische Hochschule Hannover (Germany). Inst. für Toxikologie
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS), Northeastern Collaborative Access Team (NE-CAT) and Department of Chemistry and Chemical Biology; Cornell Univ., Ithaca, NY (United States)
Botulinum neurotoxins (BoNTs) are causative agents of the life-threatening disease botulism. They are naturally produced by species of the bacteria Clostridium botulinum as stable and non-covalent complexes, in which the BoNT molecule is assembled with several auxiliary non-toxic proteins. Some BoNT serotypes, represented by the well-studied BoNT serotype A (BoNT/A), are produced by Clostridium strains that carry the ha gene cluster, which encodes four neurotoxin-associated proteins (NTNHA, HA17, HA33, and HA70) that play an important role to deliver and protect BoNTs in the gastrointestinal tract during oral intoxication. In contrast, BoNT/E- and BoNT/F-producing strains carry a distinct gene cluster that encodes five proteins (NTNHA, P47, OrfX1, OrfX2, and OrfX3, termed the $orfX$ cluster). The structures and functions of these proteins remain largely unknown. In this paper, we report the crystal structure of P47 resolved at 2.8 Å resolution. Surprisingly, P47 displays a structural topology that is similar to bactericidal/permeability-increasing (BPI) like proteins, which were previously identified only in eukaryotes. The similarity of a hydrophobic cleft of P47 with the phospholipid-binding groove of BPI suggests that P47 might be involved in lipid association to exert its function. Consistently, P47 associates and induces aggregation of asolectin-containing liposomes in a protein- and lipid-concentration dependent manner. These findings laid the foundation for future structural and functional studies of the potential roles of P47 and OrfX proteins in facilitating oral intoxication of BoNTs.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER); Swiss Federal Office for Civil Protection (FOCP); National Institute of General Medical Sciences (NIGMS); National Institute of Allergy and Infectious Diseases (NIAID); National Institutes of Health (NIH)
- Grant/Contract Number:
- R01AI091823; R01AI125704; R21AI123920; P41 GM103403; S10OD021527; AC02-06CH11357; AC02-76SF00515; P41GM103393
- OSTI ID:
- 1434740
- Alternate ID(s):
- OSTI ID: 1549483
- Journal Information:
- Toxicon, Vol. 147, Issue C; ISSN 0041-0101
- Country of Publication:
- United States
- Language:
- ENGLISH
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