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.

Homemade Pet Food Secrets

Homemade Pet Food Secrets

It is a well known fact that homemade food is always a healthier option for pets when compared to the market packed food. The increasing hazards to the health of the pets have made pet owners stick to containment of commercial pet food. The basic fundamentals of health for human beings are applicable for pets also.

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