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#hydropathy plot

2 public questions tagged with this topic.

Plasma Membrane Proteins

Which amino acid property is commonly analyzed in a hydropathy plot to predict transmembrane domains?

Computational prediction of membrane spans relies on physicochemical property hydrophobicity quantifying tendency to partition into non-polar phase. Kyte-Doolittle hydropathy scale derived from experimental water vapor transfer energies assigns isoleucine 4.5, valine 4.2, leucine 3.8, phenylalanine 2.8 as hydrophobic; arginine -4.5, lysine -3.9, asparagine -3.5, aspartate -3.5 as hydrophilic. Sliding window average length nineteen matches bilayer thickness smooths sequence revealing peaks sustained above cutoff indicating candidate transmembrane helices. Complementary scales include Goldman En

Ref: Kyte and Doolittle, Hydropathy Plot for Transmembrane Prediction, J Mol Biol 1982.

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Plasma Membrane Proteins

Which experimental technique is commonly used to determine the number of transmembrane domains in a protein?

Prediction of membrane topology begins with hydropathy profiling visualizing hydrophobic potential along polypeptide. Kyte-Doolittle scale assigns each amino acid numerical value reflecting water to vapor transfer free energy: isoleucine four point five, valine four point two, leucine three point eight highly hydrophobic, arginine minus four point five highly hydrophilic. Sliding window average typically nineteen to twenty one residues equivalent to hydrophobic thickness smooths profile revealing peaks above threshold about one point six indicating membrane-spanning segments. Positive-inside r

Ref: Kyte and Doolittle, A Simple Method for Displaying Hydropathic Character, J Mol Biol 1982.

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