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Articles by H. Bryan Brewer
Total Records ( 2 ) for H. Bryan Brewer
  W. Virgil Brown , H. Bryan Brewer , Daniel J. Rader and Ernst J. Schaefer
  Not available
  Amar A. Sethi , John A. Stonik , Fairwell Thomas , Steve J. Demosky , Marcelo Amar , Edward Neufeld , H. Bryan Brewer , W. Sean Davidson , Wilissa D`Souza , Dmitri Sviridov and Alan T. Remaley
  ApoA-I contains a tandem array of amphipathic helices with varying lipid affinity, which are critical in its ability to bind and remove lipids from cells by the ABCA1 transporter. In this study, the effect of asymmetry in the lipid affinity of amphipathic helices in a bihelical apoA-I mimetic peptide, 37pA, on lipid efflux by the ABCA1 transporter was examined. Seven peptide variants of 37pA were produced by substituting a varying number of hydrophobic amino acids for alanine on either one or both helices. The 5A peptide with five alanine substitutions in the second helix had decreased helical content compared with 37pA (5A, 12 ± 1% helicity; 37pA, 28 ± 2% helicity) and showed less self-association but, similar to the parent peptide, was able to readily solubilize phospholipid vesicles. Furthermore, 5A, unlike the parent peptide 37pA, was not hemolytic (37pA, 27 ± 2% RBC lysis, 2 h, 18 µM). Finally, the 5A peptide stimulated cholesterol and phospholipid efflux by the ABCA1 transporter with higher specificity (ABCA1-transfected versus untransfected cells) than 37pA (5A, 9.7 ± 0.77%, 18 h, 18 µM versus 1.5 ± 0.27%, 18 h, 18 µM (p < 0.0001); 37pA, 7.4 ± 0.85%, 18 h, 18µM versus 5.8 ± 0.20%, 18 h, 18µM (p = 0.03)). In summary, we describe a novel bihelical peptide with asymmetry in the lipid affinity of its helices and properties similar to apoA-I in terms of specificity for cholesterol efflux by the ABCA1 transporter and low cytotoxicity.
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