3VUO image
Deposition Date 2012-07-03
Release Date 2012-09-19
Last Version Date 2024-11-13
Entry Detail
PDB ID:
3VUO
Keywords:
Title:
Crystal structure of nontoxic nonhemagglutinin subcomponent (NTNHA) from clostridium botulinum serotype D strain 4947
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.90 Å
R-Value Free:
0.30
R-Value Work:
0.22
R-Value Observed:
0.23
Space Group:
P 32 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:NTNHA
Gene (Uniprot):ntnha
Chain IDs:A
Chain Length:1196
Number of Molecules:1
Biological Source:Clostridium botulinum
Ligand Molecules
Primary Citation
Small-angle X-ray scattering reveals structural dynamics of the botulinum neurotoxin associating protein, nontoxic nonhemagglutinin
Biochem.Biophys.Res.Commun. 425 256 260 (2012)
PMID: 22828508 DOI: 10.1016/j.bbrc.2012.07.077

Abstact

In cell culture supernatants, the botulinum neurotoxin (BoNT) exists as part of a toxin complex (TC) in which nontoxic nonhemagglutinin (NTNHA) and/or hemagglutinins (HAs) are assembled onto the BoNT. A series of investigations indicated that formation of the TC is vital for delivery of the toxin to nerve cells through the digestive tract. In the assembly process, BoNT binds to NTNHA yielding M-TC, and it then matures into L-TC by further association with the HAs via NTNHA in the M-TC. Here, we report a crystal structure of the NTNHA from Clostridium botulinum serotype D strain 4947. Additionally, we performed small-angle X-ray scattering (SAXS) analysis of the NTNHA and the M-TC to elucidate the solution structure. The crystal structure of D-4947 NTNHA revealed that BoNT and NTNHA share a closely related structure consisting of three domains. The SAXS image indicated that, even though the N-terminal two-thirds of the NTNHA molecule had an apparently similar conformation in both the crystal and solution structures, the C-terminal third of the molecule showed a more extended structure in the SAXS image than that seen in the crystallographic image. The discrepancy between the crystal and solution structures implies a high flexibility of the C-terminal third domain of NTNHA, which is involved in binding to BoNT. Structural dynamics of the NTNHA molecule revealed by SAXS may explain its binding to BoNT to form the BoNT/NTNHA complex.

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Primary Citation of related structures