One of the consequences of fatty acid having a double bond that is in a cis, rather than a trans, configuration can be an alteration in the charge of the molecule.
Unsaturated fatty acids, which usually contain cis double bonds, also are degraded by β-oxidation. However, additional (auxiliary) enzymes are required to act on the preexisting double bonds once they are close to the thioester group as a result of chain-shortening. In an unsaturated fatty acid, the carbon atoms on either side of the double bond can be in either a cis or a trans configuration. The higher the concentration of trans fatty acids, the more solid the fat, so oils are generally high in cis fatty acids, and margarine and lard are high in trans fatty acids. Cis and trans fatty acids are geometric isomers. Cis fatty acids have hydrogen bonds on the same side whereas in Trans fatty acids hydrogens are found on opposite sides of the carbon atoms.
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