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what kind of amino-acids are most commonly found in the core

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what kind of amino-acids are most commonly found in the cores (centres) of protein structures and w
what kind of amino-acids are most commonly found in the cores (centres) of protein structures and why?
- can you research what amino-acids are most common at catalytic sites and why?
most protein molecules have a hydrophobic core,which is not accessible to solvent and is built up by hydrophobic amino acids.
The hydrophobic amino acids include alanine,valine,leucine,isoleucine,proline,phenylalanine,tryptophane,cysteine and methionine
amino-acids are most common at catalytic sites:His,Cys,Asp,Arg,Glu.Because they have either acidic or basic side chains.酶催化反应大多以此为基础.