Beta sheet: Difference between revisions

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A [[beta sheet]] is a type of secondary structure, i.e. a description of how the main chain of a protein is arranged in space. It is composed of at least two beta strands. Beta strands have repetitive regular secondary structure (just like the [[alpha helix]]), i.e. all residues have similar conformation and hydrogen bonding, and it can be of arbitrary length.

~~==Your Heading Here (maybe something like 'Structure')==~~

==Structure, hydrogen bonding and composition==

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Apart from the historical fiber diffraction data, various spectroscopic techniques may be used to show the presence of beta sheets. Circular dichroism (CD) or infrared (IR) spectroscopy allows an estimate of the beta sheet content of a protein sample. NMR spectroscopy, after resonance assignment, allows secondary structure assignment residue by residue based on chemical shifts of the alpha carbon and beta carbon resonances.

==Quiz==

{What level of structure does a beta sheet refer to?}

-A. Primary structure

+B. Secondary structure

-C. Tertiary structure

-D. Quaternary structure

{What are beta sheets composed of?}

-A. Amino acid side chains

+B. Beta strands

-C. Disulfide bridges

-D. Carbohydrates

{The beta sheet is a repetitive structure.}

+A. TRUE.

-B. FALSE.

{Amino acid side chains tend to be more hydrophobic in beta sheets than alpha helices}

+A. TRUE.

-B. FALSE.

{The following amino acids are rarely found in the center of a beta sheet (more than one answer)}

+A. Proline

-B. Valine.

+C. Glycine.

-D. Isoleucine.

{Which atoms/groups are involved in forming hydrogen bonds in beta sheets?}

-A. the alpha carbons.

-B. the beta carbons.

+C. the carbonyl oxygen.

+D. the amide group.

</quiz>

==See Also==

==References==

Beta sheet: Difference between revisions

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@@ Line 1: / Line 1: @@
 A [[beta sheet]] is a type of secondary structure, i.e. a description of how the main chain of a protein is arranged in space. It is composed of at least two beta strands. Beta strands have repetitive regular secondary structure (just like the [[alpha helix]]), i.e. all residues have similar conformation and hydrogen bonding, and it can be of arbitrary length.
-==Your Heading Here (maybe something like 'Structure')==
 <StructureSection load='1f94' size='350' side='right' caption='' scene=''>
 ==Structure, hydrogen bonding and composition==
@@ Line 14: / Line 13: @@
 Apart from the historical fiber diffraction data, various spectroscopic techniques may be used to show the presence of beta sheets. Circular dichroism (CD) or infrared (IR) spectroscopy allows an estimate of the beta sheet content of a protein sample. NMR spectroscopy, after resonance assignment, allows secondary structure assignment residue by residue based on chemical shifts of the alpha carbon and beta carbon resonances.
 ==Quiz==
+<quiz display=simple>
+{What level of structure does a beta sheet refer to?}
+-A. Primary structure
++B. Secondary structure
+-C. Tertiary structure
+-D. Quaternary structure
+{What are beta sheets composed of?}
+-A. Amino acid side chains
++B. Beta strands
+-C. Disulfide bridges
+-D. Carbohydrates
+{The beta sheet is a repetitive structure.}
++A. TRUE.
+-B. FALSE.
+{Amino acid side chains tend to be more hydrophobic in beta sheets than alpha helices}
++A. TRUE.
+-B. FALSE.
+{The following amino acids are rarely found in the center of a beta sheet (more than one answer)}
++A. Proline
+-B. Valine.
++C. Glycine.
+-D. Isoleucine.
+{Which atoms/groups are involved in forming hydrogen bonds in beta sheets?}
+-A. the alpha carbons.
+-B. the beta carbons.
++C. the carbonyl oxygen.
++D. the amide group.
+</quiz>
 ==See Also==
 ==References==
 {{Reflist}}