title: Carboxy-terminal proteolytic processing of Helicobacter pylori vacuolating toxin.
abstract: The vacA gene of Helicobacter pylori strain 60190 encodes a 1, 287-amino-acid protoxin, which undergoes cleavage of a 33-amino-acid amino-terminal signal sequence and carboxy-terminal proteolytic processing to yield a mature secreted toxin. Several features of VacA suggest that it belongs to the autotransporter family of gram-negative bacterial secreted proteins. Based on matrix-assisted laser desorption ionization-time of flight mass spectrometric analysis, we calculate that the mature toxin has a mass of 88.2+/-0.2 kDa and consists of approximately 821 amino acids.
authors: Mass Spectrometry Research Center, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA.
authors: V Q
authors: VQ
authors: Nguyen
authors: R M
authors: RM
authors: Caprioli
authors: T L
authors: TL
authors: Cover
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry / Q000378:metabolism*; D001427:Bacterial Toxins / Q000378:metabolism*; D016480:Helicobacter pylori / Q000472:pathogenicity*; D013058:Mass Spectrometry; D008970:Molecular Weight
chemical_list: D001426:Bacterial Proteins; D001427:Bacterial Toxins; C074689:VacA protein, Helicobacter pylori