Proteins: Difference between revisions
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Proteins are made from [[Amino_acids|amino acids]]. | 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. | ||
There are 4 different structures that proteins can have: | |||
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.[1]<br>3.[[Tertiary Protein Structure|Tertiary Structure ]]- gives rise to a single peptide 3D structure held together by various bonds such as hydrogen bonding, disulphide bonding, salt bridges and non-polar hydrophobic interactions.<br>4.[[Quaternary Protein Structure|Quaternary Structure]] - describes multiple peptide chains<br> that interact through various types of bonding to form a fully functional protein e.g. haemoglobin. | |||
[1] Elliott.W.H, Elliott.D.C (1997) ''Biochemistry and Molecular Biology. ''New York, United States:Oxford University Press.pp.47-49.ISBN 0199271992 | |||
Revision as of 17:06, 15 November 2010
Proteins are polymer structures made from different amino acids. The number of amino acids within a sequence can vary from 20 amino acids to thousands of amino acids long.
There are 4 different structures that proteins can have:
1.Primary Structure - linear amino acid sequence
2.Secondary Structure - gives rise to an alpha helix or beta pleated sheet held together by hydrogen bonds.[1]
3.Tertiary Structure - gives rise to a single peptide 3D structure held together by various bonds such as hydrogen bonding, disulphide bonding, salt bridges and non-polar hydrophobic interactions.
4.Quaternary Structure - describes multiple peptide chains
that interact through various types of bonding to form a fully functional protein e.g. haemoglobin.
[1] Elliott.W.H, Elliott.D.C (1997) Biochemistry and Molecular Biology. New York, United States:Oxford University Press.pp.47-49.ISBN 0199271992