Beta sheet

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One of the folding patterns of proteins are known as Beta sheets. Another common folding pattern is known as an [[Alpha-helix|alpha-helix.]]   
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A beta sheet is an example of [[Protein secondary stucture|protein secondary stucture]]. Another common folding pattern is known as an [[Alpha-helix|alpha-helix.]]   
  
Beta sheets occur due to [[Hydrogen bonds|hydrogen bonds]] between the amine and carboxyl groups of the polypeptide backbone, thus making it a very strong and rigid structure. because the hydrogen bonds occur between the groups on the backbone and not the side chains on the amino acids, many different sequences of amino acids(therefore many different proteins) can fold to produce beta sheets.  
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Beta sheets occur due to [[Hydrogen bonds|hydrogen bonds]] between the [[Amine|amine]] (NH) and [[Carboxyl group|carboxyl groups]] (CO) of the [[Polypeptide|polypeptide]] backbone, thus making it a very strong and rigid structure. Because the [[Hydrogen bonds|hydrogen bonds]] occur between the groups on the backbone and not the side chains on the [[Amino acid|amino acids]], many different sequences of [[Amino acids|amino acids]] (therefore many different proteins) can fold to produce beta sheets.  
  
There are two types of beta sheets, parallalel and anti-parallel sheets. parallel beta sheets are chains of [[Polypeptides|polypeptides]] which run in the same direction. Antiparallel beta sheets are chains of polypeptides which run in opposite directions to each other.  
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There are two types of beta sheets, [[Parallel beta sheet|parallel]] and [[Anti-parallel beta sheet|anti-parallel]] sheets. Parallel beta sheets are chains of [[Polypeptides|polypeptides]], which run in the same direction. Anti-parallel beta sheets are chains of polypeptides which run in opposite directions to each other<ref>Alberts, B, et al, 2008. Molecular Biology of the Cell. 5th ed. United States of America: Garland Science.</ref>. &nbsp;In the antiparallel structure, [[Hydrogen_bond|hydrogen bond]]ing occurs respectively between the NH group and CO group of one amino acid with the CO group and NH group of the amino acid on the adjacent chain. In the parallel structure, hydrogen bonding is slightly different, rather than the CO group being bonded directly to the adjacent NH group, it is instead bonded to the NH group on the amino acid two residues further along the chain. This means that in the parallel structure, every amino acid is bonded to two different amino acids on the opposite chain rather than one<ref>Berg JM, Tymoczko JL, Gatto, Jr. GJ, Stryer L. Biochemistry. 8th edition, New York: W. H. Freeman and Company. 2015</ref>.  
  
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=== References  ===
  
&nbsp;<references /> <ref>Alberts, B, et al, 2008. Molecular Biology of the Cell. 5th ed. United States of America: Garland Science.</ref><references />
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<references />.<br>

Latest revision as of 11:04, 29 November 2018

A beta sheet is an example of protein secondary stucture. Another common folding pattern is known as an alpha-helix. 

Beta sheets occur due to hydrogen bonds between the amine (NH) and carboxyl groups (CO) of the polypeptide backbone, thus making it a very strong and rigid structure. Because the hydrogen bonds occur between the groups on the backbone and not the side chains on the amino acids, many different sequences of amino acids (therefore many different proteins) can fold to produce beta sheets.

There are two types of beta sheets, parallel and anti-parallel sheets. Parallel beta sheets are chains of polypeptides, which run in the same direction. Anti-parallel beta sheets are chains of polypeptides which run in opposite directions to each other[1].  In the antiparallel structure, hydrogen bonding occurs respectively between the NH group and CO group of one amino acid with the CO group and NH group of the amino acid on the adjacent chain. In the parallel structure, hydrogen bonding is slightly different, rather than the CO group being bonded directly to the adjacent NH group, it is instead bonded to the NH group on the amino acid two residues further along the chain. This means that in the parallel structure, every amino acid is bonded to two different amino acids on the opposite chain rather than one[2].

References

  1. Alberts, B, et al, 2008. Molecular Biology of the Cell. 5th ed. United States of America: Garland Science.
  2. Berg JM, Tymoczko JL, Gatto, Jr. GJ, Stryer L. Biochemistry. 8th edition, New York: W. H. Freeman and Company. 2015
.
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