LPleated Sheet

Extended polypeptide chains can associate by hydrogen bonding to form sheetlike structures in parallel /-sheets, with all /-strands pointed in the same direction, and in antiparallel /-pleated sheets, with alternate strands pointed in opposite direction. Individual /-strands or /-pleated sheets have a structure generated by a regular sequence of dihedral angles (<p = —120° and \|/ = +140°) that orient the NH and C = O bonds nearly perpendicular to the long axis of the polypeptide chain. Also, the idealized ¡3-structure based on 2.0 residues per turn originally proposed was a flat pleated sheet structure; actual /-pleated sheets found in proteins usually have a left-handed twist. Globular proteins contain about 15% sheet structures. The average length of /-structure is about 6 residues, which is equal to 20 A in length, corresponding approximately to the diameters of domains.

Fantastic Organic Food Facts

Fantastic Organic Food Facts

Get All The Support And Guidance You Need To Be A Success At Utilizing Organic Foods. This Book Is One Of The Most Valuable Resources In The World When It Comes To Getting The Right Information About Eating Healthy With Organic Food.

Get My Free Ebook

Post a comment