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| Proteins are polymer structures made from different [[Amino acids|amino acids]]. The number of [[Amino_acids|amino acids]] within a sequence can vary from 20 [[Amino acids|amino acids]] to thousands of [[Amino_acids|amino acids]] long.
| | See [[Protein|Protein]]<br> |
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| There are 4 different structures that proteins can have:
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| 1. [[Primary Protein Structure|Primary Structure ]]- linear amino acid sequence <br>2. [[Secondary Protein Structure|Secondary Structure ]]- gives rise to an alpha helix or beta pleated sheet held together by hydrogen bonds <ref>Elliott.W.H, Elliott.D.C (1997) Biochemistry and Molecular Biology. New York, United States:Oxford University Press.pp.47-49.ISBN 0199271992</ref>.<br>3. [[Tertiary Protein Structure|Tertiary Structure ]]- gives rise to a single peptide 3D structure held together by various bonds such as [[Hydrogen bonds|hydrogen bonding]], [[Disulphide bonds|disulphide bonding]], salt bridges and non-polar hydrophobic interactions.<br>4. [[Quaternary Protein Structure|Quaternary Structure]] - describes multiple peptide chains that interact through various types of bonding to form a fully functional protein e.g. haemoglobin.
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| === References ===
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| <references />
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Latest revision as of 07:56, 26 November 2010