Anti-parallel beta sheet

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There are two types of Beta-sheets ,parallel and anti-parrallel. Anti-parallel strands run in opposite directions to each other this means that the hydrogen bonds between the strands that stabalise the structure are straight. They form between the NH group on one amino acid and the CO group on the opposite amino acid strand, this also happens between the NH group on this amino acid and CO group on the other amino acid, so overall there are two hydrogen bonds between the two amino acids.[1] 

References 

  1. ↑ Jeremy M. Berg, John L. Tymoczko, Lubert Stryer, 2011, Biochemistry, seventh edition, New York, Basingstoke : Palgrave Macmillan
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