<P> Valine ( symbol Val or V ) is an α - amino acid that is used in the biosynthesis of proteins . It contains an α - amino group ( which is in the protonated − NH form under biological conditions ) , an α - carboxylic acid group ( which is in the deprotonated − COO form under biological conditions ) , and a side chain isopropyl group , making it a non-polar aliphatic amino acid . It is essential in humans , meaning the body can not synthesize it : it must be obtained from the diet . Human dietary sources are foods that contain protein , such as meats , dairy products , soy products , beans and legumes . In the genetic code it is encoded by all codons starting with GU , namely GUU , GUC , GUA , and GUG . </P>
<P> Valine ( symbol Val or V ) is an α - amino acid that is used in the biosynthesis of proteins . It contains an α - amino group ( which is in the protonated − NH form under biological conditions ) , an α - carboxylic acid group ( which is in the deprotonated − COO form under biological conditions ) , and a side chain isopropyl group , making it a non-polar aliphatic amino acid . It is essential in humans , meaning the body can not synthesize it : it must be obtained from the diet . Human dietary sources are foods that contain protein , such as meats , dairy products , soy products , beans and legumes . In the genetic code it is encoded by all codons starting with GU , namely GUU , GUC , GUA , and GUG . </P>
the side chain for valine is classified as a
the side chain for valine is classified as a
isopropyl group
isopropyl group