Why is the amino acid leucine found in interior of a protein?

Answer 1

http://www.chembio.uoguelph.ca/educmat/phy456/456lec02.htm

Answer 2

Proteins are polymers of amino acids. That means that they are long chains made from smaller links called amino acids. There are often many thousands of amino acids linked together to form a protein. In humans there are 20 different amino acids that are used, leucine is one of them. Many of the amino acids humans need can be built up within our bodies, but some of them must be eaten as part of our diet. Those are called the "essential" amino acids.

Leucine has a side chain made up of a hydrocarbon (C4H9) so it is hydrophobic and would tend to avoid exposure on the outside of the structure of the folded protein chain. Other amino acids like arginine or aspartic acid have hydroxyl or amine groups which are hydrophilic and tend to be exposed to the surrounding water environment.

Answer 3

Because leucine is a hydrophobic [hates water and is unpolar][water is polar] amino acid, so it is always locating itself in the interior of proteins, so it can hide from the water~! i hope it is easy to understand.
Please mark me as the best answer and forget about the two other BS answers.

Answer 4

because is one of the 20 necessary aminoacids in any living body, to form proteins...simple like that,,,,its just a necessary aminoacid as normal component of normal proteins,,,,,