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RNase A Oligomers: Difference between revisions

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{{BAMBED
|DATE=May 26, 2011
|OLDID=1249782
|BAMBEDDOI=10.1002/bmb.20568
}}
<StructureSection load='' size='450' side='right' scene='Sandbox_Reserved_200/Minor_dimer/4' caption=''>
[[Image:2D_RNaseA.png|300px|left|thumb|RNase A minor dimer, [[1a2w]]]]
[[Image:2D_RNaseA.png|300px|left|thumb|RNase A minor dimer, [[1a2w]]]]
Bovine pancreatic ribonuclease A [http://en.wikipedia.org/wiki/Ribonuclease_A (RNase A)] is an enzyme that catalyzes the hydrolysis of RNA through [http://www.proteopedia.org/wiki/index.php/Sandbox_Reserved_193 acid-base catalysis].  RNase A has the capability to structurally form dimers, trimers, tetramers, and pentamers based on the structure of the [http://www.proteopedia.org/wiki/index.php/Sandbox_Reserved_192 RNase A monomer].  Though there are many oligomers, the three-dimensional structure for only the major dimer, minor dimer, and minor trimer are known.  Unlike the monomers, all the oligomers are capable of catalyzing the hydrolysis of double stranded RNA (dsRNA).<ref name="tumor">PMID:12697760</ref>  The oligomers are formed by 3D domain swapping, which can occur once or twice per monomeric unit <ref name="liul">PMID:11224563</ref >.  The 3D domain swapping has no impact on the formation of active sites which is the same in the monomers and all oligomers.<ref name="liul"/>  The oligomers of RNase A also show medical relevance as [Pharma Drugs|antitumor drugs]] as well as models to understand the possible cause of [[Alzheimer's Disease]].
Bovine pancreatic '''ribonuclease A (RNase A)''' is an enzyme that catalyzes the hydrolysis of RNA through [http://www.proteopedia.org/wiki/index.php/Sandbox_Reserved_193 acid-base catalysis].  RNase A has the capability to structurally form dimers, trimers, tetramers, and pentamers based on the structure of the [http://www.proteopedia.org/wiki/index.php/Sandbox_Reserved_192 RNase A monomer].  Though there are many oligomers, the three-dimensional structure for only the major dimer, minor dimer, and minor trimer are known.  Unlike the monomers, all the oligomers are capable of catalyzing the hydrolysis of double stranded RNA (dsRNA).<ref name="tumor">PMID:12697760</ref>  The oligomers are formed by 3D domain swapping, which can occur once or twice per monomeric unit <ref name="liul">PMID:11224563</ref >.  The 3D domain swapping has no impact on the formation of active sites which is the same in the monomers and all oligomers.<ref name="liul"/>  The oligomers of RNase A also show medical relevance as [[Pharmaceutical Drugs|antitumor drugs]] as well as models to understand the possible cause of [[Alzheimer's Disease]].


==Dimers==
==Dimers==
<Structure load='1a2w' size='350' frame='true' align='right' caption='Ribonuclease A Minor Dimer, [[1a2w]]' scene='Sandbox_Reserved_200/Minor_dimer/4' />
 
Ribonuclease A has both a <scene name='Sandbox_Reserved_200/Major_dimer/11'>major</scene> and <scene name='Sandbox_Reserved_200/Minor_dimer/4'>minor</scene> dimer which are very similar to one another. Though they are similar, they are formed by different types of 3D domain swapping.  3D domain swapping occurs when identical domains are interchanged.  The major dimer is formed by 3D domain swapping the β-strand of the C-terminus.<ref name="liu98"/> The minor dimer, on the other hand, is formed by 3D domain swapping of the α-helix on the N-terminus <ref name="liu98"/>.  Domain swapping is extremely specific and can only occur at the <scene name='Sandbox_Reserved_200/Major_dimer/10'>C-terminus</scene> or the <scene name='Sandbox_Reserved_200/Major_dimer/9'>N-terminus</scene>.
Ribonuclease A has both a <scene name='Sandbox_Reserved_200/Major_dimer/11'>major</scene> and <scene name='Sandbox_Reserved_200/Minor_dimer/4'>minor</scene> dimer which are very similar to one another. Though they are similar, they are formed by different types of 3D domain swapping.  3D domain swapping occurs when identical domains are interchanged.  The major dimer is formed by 3D domain swapping the β-strand of the C-terminus.<ref name="liu98"/> The minor dimer, on the other hand, is formed by 3D domain swapping of the α-helix on the N-terminus <ref name="liu98"/>.  Domain swapping is extremely specific and can only occur at the <scene name='Sandbox_Reserved_200/Major_dimer/10'>C-terminus</scene> or the <scene name='Sandbox_Reserved_200/Major_dimer/9'>N-terminus</scene>.


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Not only is the structure of the monomers conserved in the dimers, but the active is also conserved. <ref name="liu98"/>  The <scene name='Sandbox_Reserved_200/Minor_dimer/9'>active site</scene> of both dimers contains His12, Lys41, and His119 residues.  The active sites are a composite of the monomer subunits containing <scene name='Sandbox_Reserved_200/Minor_dimer/7'>His 12</scene> from one monomer and His119 form the other monomer.<ref name="liul"/>  During domain swapping, the active site is not disturbed, so the dimers are able to retain their enzymatic activity.   
Not only is the structure of the monomers conserved in the dimers, but the active is also conserved. <ref name="liu98"/>  The <scene name='Sandbox_Reserved_200/Minor_dimer/9'>active site</scene> of both dimers contains His12, Lys41, and His119 residues.  The active sites are a composite of the monomer subunits containing <scene name='Sandbox_Reserved_200/Minor_dimer/7'>His 12</scene> from one monomer and His119 form the other monomer.<ref name="liul"/>  During domain swapping, the active site is not disturbed, so the dimers are able to retain their enzymatic activity.   


==Trimers==
==Trimers==
RNase A trimers are formed in the same way as the dimers, except there are now three monomeric subunits.  There is both a major and minor trimer.  The structure of the major trimer is not known, but the two trimers can be separated by both chromatography and gel electrophoresis. <ref name="liu01"/>  The major trimer is more common than the minor trimer.
RNase A trimers are formed in the same way as the dimers, except there are now three monomeric subunits.  There is both a major and minor trimer.  The structure of the major trimer is not known, but the two trimers can be separated by both chromatography and gel electrophoresis. <ref name="liu01"/>  The major trimer is more common than the minor trimer.
<Structure load='1JS0' size='350' frame='true' align='left' caption='Minor Trimer of RNase A, [[1js0]]' scene='Sandbox_Reserved_200/Minor_trimer/12' />
The <scene name='Sandbox_Reserved_200/Minor_trimer/12'>minor trimer</scene> forms a cyclic propeller like shape.  It is 3D domain swapped at the C-terminus of the beta strand.<ref name="liu01"/>  No domain swapping a the N-terminus has been seen.  When the minor trimer dissociates, it forms a dimer and a monomer.  The minor and major dimer are both formed, but the major dimer is much more common.<ref name="liu01"/>     
The <scene name='Sandbox_Reserved_200/Minor_trimer/12'>minor trimer</scene> forms a cyclic propeller like shape.  It is 3D domain swapped at the C-terminus of the beta strand.<ref name="liu01"/>  No domain swapping a the N-terminus has been seen.  When the minor trimer dissociates, it forms a dimer and a monomer.  The minor and major dimer are both formed, but the major dimer is much more common.<ref name="liu01"/>     


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* [http://www.proteopedia.org/wiki/index.php/RNaseS_RNaseB RNase S and RNase B]
* [http://www.proteopedia.org/wiki/index.php/RNaseS_RNaseB RNase S and RNase B]
* [http://www.proteopedia.org/wiki/index.php/RNaseA_Nobel_Prizes RNase A Nobel Prizes]
* [http://www.proteopedia.org/wiki/index.php/RNaseA_Nobel_Prizes RNase A Nobel Prizes]
</StructureSection>
__NOTOC__


==3D structures of ribonuclease==
==3D structures of ribonuclease==
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*[http://www.proteopedia.org/wiki/index.php/User:Lexi_Gehring Lexi Gehring and Deanna Proimos]
*[http://www.proteopedia.org/wiki/index.php/User:Lexi_Gehring Lexi Gehring and Deanna Proimos]
[[Category:Featured in BAMBED]]

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