2a1s: Difference between revisions

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[[Image:2a1s.gif|left|200px]]
[[Image:2a1s.png|left|200px]]


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==Overview==
{{ABSTRACT_16281054}}
Poly(A)-specific ribonuclease (PARN) is a processive, poly(A)-specific 3' exoribonuclease. The crystal structure of C-terminal truncated human PARN determined in two states (free and RNA-bound forms) reveals that PARNn is folded into two domains, an R3H domain and a nuclease domain similar to those of Pop2p and epsilon186. The high similarity of the active site structures of PARNn and epsilon186 suggests that they may have a similar catalytic mechanism. PARNn forms a tight homodimer, with the R3H domain of one subunit partially enclosing the active site of the other subunit and poly(A) bound in a deep cavity of its nuclease domain in a sequence-nonspecific manner. The R3H domain and, possibly, the cap-binding domain are involved in poly(A) binding but these domains alone do not appear to contribute to poly(A) specificity. Mutations disrupting dimerization abolish both the enzymatic and RNA-binding activities, suggesting that the PARN dimer is a structural and functional unit. The cap-binding domain may act in concert with the R3H domain to amplify the processivity of PARN.


==About this Structure==
==About this Structure==
2A1S is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. The following page contains interesting information on the relation of 2A1S with [[http://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb86_1.html Exosomes]]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2A1S OCA].  
2A1S is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. The following page contains interesting information on the relation of 2A1S with [[http://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb86_1.html Exosomes]]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2A1S OCA].  
==Reference==
Structural insight into poly(A) binding and catalytic mechanism of human PARN., Wu M, Reuter M, Lilie H, Liu Y, Wahle E, Song H, EMBO J. 2005 Dec 7;24(23):4082-93. Epub 2005 Nov 10. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16281054 16281054]
[[Category: Exosomes]]
[[Category: Exosomes]]
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Parn]]
[[Category: Parn]]
[[Category: R3h]]
[[Category: R3h]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 18:29:47 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jun 26 18:10:50 2008''

Revision as of 18:10, 26 June 2008

File:2a1s.png

Template:STRUCTURE 2a1s

Crystal structure of native PARN nuclease domain


Template:ABSTRACT 16281054

About this StructureAbout this Structure

2A1S is a Single protein structure of sequence from Homo sapiens. The following page contains interesting information on the relation of 2A1S with [Exosomes]. Full crystallographic information is available from OCA.

Page seeded by OCA on Thu Jun 26 18:10:50 2008

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