Lesson: beta turns: Difference between revisions
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New page: A '''beta turn''' is a secondary structure element consisting of four consecutive amino acids (or three consecutive peptide planes). The geometry of turns correspond to a change in the dir... |
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==Turns in 3D== | ==Turns in 3D== | ||
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<StructureSection load='' size='350' side='right' caption='' scene='10/1072233/Turn_2mhr/2'> | <StructureSection load='' size='350' side='right' caption='' scene='10/1072233/Turn_2mhr/2'> | ||
===Basic features=== | ===Basic features=== | ||
The interactive Jmol window on the right shows a beta turn (<scene name='10/1072233/Turn_2mhr/2'>reload initial scene</scene>) indicating the short distance between the first and the fourth alpha carbon. Because of this short distance, the polypeptide takes a sharp turn, sometimes also called a reverse turn. There are many types of beta turns, and they differ in the phi and psi angles of residues two and three. Some turns feature a <scene name='10/1072233/Turn_2mhr/4'>hydrogen bond</scene> between residues one and four (like the one shown here) and others don't. | The interactive Jmol window on the right shows a beta turn (<scene name='10/1072233/Turn_2mhr/2'>reload initial scene</scene>) indicating the short distance between the first and the fourth alpha carbon. Because of this short distance, the polypeptide takes a sharp turn, sometimes also called a reverse turn. There are many types of beta turns, and they differ in the phi and psi angles of residues two and three<ref>PMID:7756980</ref>. Some turns feature a <scene name='10/1072233/Turn_2mhr/4'>hydrogen bond</scene> between residues one and four (like the one shown here) and others don't. | ||
===Beta turns in the context of other secondary structures=== | ===Beta turns in the context of other secondary structures=== | ||
