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Structural and mutational analyses of the receptor binding domain of botulinum D/C mosaic neurotoxin : Insight into the ganglioside binding mechanism

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Title: Structural and mutational analyses of the receptor binding domain of botulinum D/C mosaic neurotoxin : Insight into the ganglioside binding mechanism
Authors: Nuemket, Nipawan Browse this author
Tanaka, Yoshikazu Browse this author →KAKEN DB
Tsukamoto, Kentaro Browse this author
Tsuji, Takao Browse this author
Nakamura, Keiji Browse this author
Kozaki, Shunji Browse this author
Yao, Min Browse this author
Tanaka, Isao Browse this author
Keywords: Botulinum neurotoxin
D/C mosaic
Receptor binding domain
Crystal structure
Ganglioside recognition
Issue Date: 29-Jul-2011
Publisher: Elsevier
Journal Title: Biochemical and Biophysical Research Communications
Volume: 411
Issue: 2
Start Page: 433
End Page: 439
Publisher DOI: 10.1016/j.bbrc.2011.06.173
PMID: 21749855
Abstract: Clostridium botulinum type D strain OFD05, which produces the D/C mosaic neurotoxin, was isolated from cattle killed by the recent botulism outbreak in Japan. The D/C mosaic neurotoxin is the most toxic of the botulinum neurotoxins (BoNT) characterized to date. Here, we determined the crystal structure of the receptor binding domain of BoNT from strain OFD05 in complex with 3'-sialyllactose at a resolution of 3.0Å. In the structure, an electron density derived from the 3'-sialyllactose was confirmed at the cleft in the C-terminal subdomain. Alanine site-directed mutagenesis showed the significant contribution of the residues surrounding the cleft to ganglioside recognition. In addition, a loop adjoining the cleft also plays an important role in ganglioside recognition. In contrast, little effect was observed when the residues located around the surface previously identified as the protein receptor binding site in other BoNTs were substituted. The results of cell binding analysis of the mutants were significantly correlated with the ganglioside binding properties. Based on these observations, a cell binding mechanism of BoNT from strain OFD05 is proposed, which involves cooperative contribution of two ganglioside binding sites.
Type: article (author version)
URI: http://hdl.handle.net/2115/47078
Appears in Collections:創成研究機構 (Creative Research Institution) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 田中 良和

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