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Home > Art, Film & Photography > Bacterial Proteins: Cholera Toxin, Penicillin Binding Proteins, Reca, Repressor Lexa, Camp Receptor Protein, Dnac, Clumping Factor A, Mscramm
Bacterial Proteins: Cholera Toxin, Penicillin Binding Proteins, Reca, Repressor Lexa, Camp Receptor Protein, Dnac, Clumping Factor A, Mscramm

Bacterial Proteins: Cholera Toxin, Penicillin Binding Proteins, Reca, Repressor Lexa, Camp Receptor Protein, Dnac, Clumping Factor A, Mscramm


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About the Book

Chapters: Cholera Toxin, Penicillin Binding Proteins, Reca, Repressor Lexa, Camp Receptor Protein, Dnac, Clumping Factor A, Mscramm, Lcrv, Dnax, Somatic Antigen, Spot. Source: Wikipedia. Pages: 38. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: Cholera toxin (sometimes abbreviated to CTX, Ctx, or CT) is a protein complex secreted by the bacterium Vibrio cholerae. CTX is responsible for the harmful effects of cholera infection. The cholera toxin is an oligomeric complex made up of six protein subunits: a single copy of the A subunit (part A, enzymatic), and five copies of the B subunit (part B, receptor binding). The two parts are connected by a disulfide bond. The three-dimensional structure of the toxin was determined using X-ray crystallography by Zhang et al. in 1995. The five B subunitseach weighing 12 kDa, and all coloured blue in the accompanying figureform a five-membered ring. The A subunit has two important segments. The A1 portion of the chain (CTA1, red) is a globular enzyme payload that ADP-ribosylates G proteins, while the A2 chain (CTA2, orange) forms an extended alpha helix which sits snugly in the central pore of the B subunit ring. This structure is similar in shape, mechanism, and sequence to the heat-labile enterotoxin secreted by some strains of the Escherichia coli bacterium. The pentameric part B of the toxin molecule binds to the surface of the intestinal epithelium cells. Part A detaches from the pentameric part upon binding, and gets inside the cell via receptor-mediated endocytosis. Once inside the cell, it permanently ribosylates the Gs alpha subunit of the heterotrimeric G protein resulting in constitutive cAMP production. This in turn leads to secretion of H2O, Na, K, Cl, and HCO3 into the lumen of the small intestine resulting in rapid dehydration and other ...More: http: //booksllc.net/?id=549994


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Product Details
  • ISBN-13: 9781157467359
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • Sub Title: Cholera Toxin, Penicillin Binding Proteins, Reca, Repressor Lexa, Camp Receptor Protein, Dnac, Clumping Factor A, Mscramm
  • Width: 229 mm
  • ISBN-10: 1157467350
  • Publisher Date: 15 Sep 2010
  • Binding: Paperback
  • Spine Width: 3 mm
  • Weight: 73 gr


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