Secondary structure: Difference between revisions
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<applet load='1dtg' size='400' frame='true' align='right' caption='' scene=' | <applet load='1dtg' size='400' frame='true' align='right' caption='' scene='Secondary_structure/1dtg_ss/1'/> | ||
Secondary structure of a protein refers to the three-dimensional structure of local segments of a protein. Each type of secondary structure has segments that have a repeating conformational pattern which is produced by a repeating pattern of values for the [[Psi and Phi Angles|phi and psi torsional angles]]. For this reason on a [[Ramachandran Plots|Ramachandran plot]] for a particular secondary structure the values for phi and psi are located at a particular area of the plot. | Secondary structure of a protein refers to the three-dimensional structure of local segments of a protein. Each type of secondary structure has segments that have a repeating conformational pattern which is produced by a repeating pattern of values for the [[Psi and Phi Angles|phi and psi torsional angles]]. For this reason on a [[Ramachandran Plots|Ramachandran plot]] for a particular secondary structure the values for phi and psi are located at a particular area of the plot. | ||
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*'''Turns'''. β-turn and γ-turn are the two types of turns. β-turns are composed of four amino acids and can have several difference conformations. γ-turns are made up of only three amino acids and are therefore a much tighter turn. More detail and illustrations of these turns are at [[Turns in Proteins]]. | *'''Turns'''. β-turn and γ-turn are the two types of turns. β-turns are composed of four amino acids and can have several difference conformations. γ-turns are made up of only three amino acids and are therefore a much tighter turn. More detail and illustrations of these turns are at [[Turns in Proteins]]. | ||
The structure of a human transferrin n-lobe mutant (PDB code [[1dtg]]) is shown in cartoon and colored structure to highlight its secondary structure, with alpha-helices in magenta and beta-sheets in yellow. Another example is <scene name='Secondary_structure/Gly_phosphyl/ | The structure of a human transferrin n-lobe mutant (PDB code [[1dtg]]) is shown in cartoon and colored structure to highlight its secondary structure, with alpha-helices in magenta and beta-sheets in yellow. Another example is <scene name='Secondary_structure/Gly_phosphyl/2'>domain 2 of glycogen phosphorylase</scene> (PDB code [[1abb]]). (When Proteopedia is upgraded to run in Jmol ver. 12, other types of helices in addition to α-helices as well as a number of β-turns will be shown in these two examples.) | ||
{{Clear}} | {{Clear}} | ||
<table width='410' align='right' cellpadding='10'><tr><td bgcolor='#eeeeee'><center>'''Secondary Structures of Examples'''<scene name=' | <table width='410' align='right' cellpadding='10'><tr><td bgcolor='#eeeeee'><center>'''Secondary Structures of Examples'''<scene name='Secondary_structure/1dtg_ss/1'> (Initial scene)</scene></center></td></tr></table> | ||
== External Links == | == External Links == | ||
For more information, see [http://en.wikipedia.org/wiki/Secondary_structure Wikipedia's page on secondary structure]. | For more information, see [http://en.wikipedia.org/wiki/Secondary_structure Wikipedia's page on secondary structure]. | ||
