Credit: FRANCIS LEROY & MICHAEL PIERARD, BIOCOSMOS/SCIENCE PHOTO LIBRARY

Caption: Animation showing the freedom of rotation around the central carbon atom between two planar amide groups (blue). The amide, or peptide, group (C(=O)NH) is the linkage between two amino acids in the backbone of a protein, represented as the thick black bonds here. Each amide group is a flat plane due to delocalisation of the electrons in the N-C=O group. Within each amino acid, though, the bonds are free to rotate, which makes the chain very flexible. In practice, the side chain of the amino acid (represented by the pink R) obstructs this rotation to some degree, dependent on the shape and composition of the side group. This effect is very important in determining the shape of proteins from their amino acid sequence.

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Keywords: acids, amide, amino acid, animated, animation, atom, atoms, backbone, biochemical, biochemistry, biological, biology, bond, bonding, bonds, chemical, chemistry, degree of freedom, degrees, delocalisation, delocalised, education, educational, group, groups, link, linkage, moiety, molecular, molecule, molecules, peptide, peptides, planar, plane, planes, polypeptide, primary, protein, proteins, rotating, rotation, secondary, sp2, structural, structure

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Rotation around amide bonds in protein

K004/5879 Rights Managed

Downloadable master

Duration: 00:00:08.01

Frame size: 1920x1080

Frame rate: 25

Audio: No

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 38.0M

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Capture format: QuickTime Animation

Codec: H.264

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