Positions of Polar Amino Acids Alter Interactions between Transmembrane Segments and Detergents

被引:16
|
作者
Tulumello, David V.
Deber, Charles M. [1 ]
机构
[1] Hosp Sick Children, Div Mol Struct & Funct, Res Inst, Toronto, ON M5G 1X8, Canada
基金
加拿大健康研究院;
关键词
SULFATE-POLYACRYLAMIDE GELS; SIDE-CHAIN INTERACTIONS; MEMBRANE-PROTEINS; DODECYL SULFATE; ALPHA-HELICES; PEPTIDES; OLIGOMERIZATION; RESIDUES; MOBILITY; CFTR;
D O I
10.1021/bi200238g
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
alpha-Helical transmembrane (TM) segments in membrane proteins are comprised primarily of hydrophobic amino acids that accommodate insertion from water into the nonpolar membrane bilayer. In many such segments, however, polar residues are also present for structural or functional reasons. These latter residues impair the local favorable acyl interactions required for solvation by hydrophobic media such as phospholipids in native bilayers or detergents used for in vitro characterization. Using a series of Lys-tagged designed TM-like peptides (typified by KK-YAAAIAAIAWAIAAIAAAIAA-KKK) in which single-Asn residue substitutions (from Ile or Ala) were made successively from the center of the hydrophobic region toward the C-terminus, we demonstrate that polar residues strongly alter the nature of the interaction between TM segments and the solvating detergent. Through the application of sodium dodecyl sulfate polyacrylamide gel electrophoresis, circular dichroism spectroscopy, and tryptophan fluorescence, we observed drastic differences in the structures of the detergent peptide complexes that contain relatively minor sequence differences. For example, the blue shift of the Trp fluorescence (indicating local detergent solvation at this location) differs by as much as similar to 10 nm depending upon the position of a single Asn substitution in an otherwise identical segment. The overall results suggest that polar point mutations occurring in a biological membrane will elicit comparable effects, placing a significant refolding burden on the local protein structure and potentially leading to disease states through altered protein lipid interactions in membrane proteins.
引用
收藏
页码:3928 / 3935
页数:8
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