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Key

Two stretches of the polypeptide chain may also adopt a planar structure. In this instance, the hydrogen-bonds responsible for the stability of the structure involve C=O and N-H from non-contiguous aminoacids :

Parallel β-sheet. This is a parallel β-sheet: both aminoacids stretches have the same orientation (check in which sense the

N-C_α-C=O

Parallel β-sheet (with sidechains)

In a parallel β-sheet, sidechains alternatedly poit upwards and downwards from the plane of the sheet. Spin the structure in order to fully appreciate it. See how one both faces of the sheet contain only hydrophobic residues (and therefore probably face the protein core)

Parallel β-sheet in the protein

The tertiary structure of the protein

Other interactive models:

α-helix Parallel β-sheet Anti-parallel β-sheet NADH dehidrogenase Succinate dehidrogenase Cytochrome bc1 complex Cytochrome c oxidase Hemoglobin Oxyhemoglobin (I) Oxyhemoglobin (II)

Metabolic pathways:

Metabolic regulation and integration Fatty acids metabolism Glycolysis Citric acid cycle Fermentation and respiration Glycogen synthesis and glycogenolysis Gluconeogenesis Aminoacid degradation and urea cycle Pentose phosphate pathway

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