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1txp

From Proteopedia

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{{STRUCTURE_1txp| PDB=1txp | SCENE= }}
{{STRUCTURE_1txp| PDB=1txp | SCENE= }}
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'''Heterogeneous Nuclear Ribonucleoprotein (hnRNP) C Oligomerization Domain Tetramer'''
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===Heterogeneous Nuclear Ribonucleoprotein (hnRNP) C Oligomerization Domain Tetramer===
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==Overview==
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During active cell division, heterogeneous nuclear ribonucleoprotein (hnRNP) C is one of the most abundant proteins in the nucleus. hnRNP C exists as a stable tetramer that binds about 230 nucleotides of pre-mRNA and functions in vivo to package nascent transcripts and nucleate assembly of the 40 S hnRNP complex. Previous studies have shown that monomers lacking or possessing mutant oligomerization domains bind RNA with low affinity, strongly suggesting a cooperative protomer-RNA binding mode. In order to understand the role of the oligomerization domain in defining the biological functions and structure of hnRNP C tetramers, we have determined the high-resolution NMR structure of the oligomerization interface that is formed at the core of the complex, examining specific molecular interactions that drive assembly and contribute to the structural integrity of the tetramer. The determined structure reveals an antiparallel four-helix coiled coil, where classically described knobs-into-holes packing interactions at interhelical contact surfaces are optimized so that side-chains interdigitate to create an even distribution of hydrophobic surfaces along the core. While the stoichiometry of the complex appears to be primarily specified by occlusion of hydrophobic surfaces, particularly the interfacial residue L198, from solvent, helix orientation is primarily determined by electrostatic attractions across helix interfaces. The creation of potential interaction surfaces for other hnRNP C domains along the coiled coil exterior and the assembly of oligomerization interfaces in an antiparallel orientation shape the tertiary fold of full-length monomers and juxtapose RNA-binding elements at distal surfaces of the tetrameric complex in the quaternary assembly. In addition, we discuss the specific challenges encountered in structure determination of this symmetric oligomer by NMR methods, specifically in sorting ambiguous interatomic distance constraints into classes that define different elements of the coiled coil structure.
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(as it appears on PubMed at http://www.pubmed.gov), where 15936032 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15936032}}
==About this Structure==
==About this Structure==
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1TXP is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TXP OCA].
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1TXP is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TXP OCA].
==Reference==
==Reference==
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[[Category: Whitson, S R.]]
[[Category: Whitson, S R.]]
[[Category: Antiparallel four helix coiled coil tetramer hnrnpc]]
[[Category: Antiparallel four helix coiled coil tetramer hnrnpc]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 10:29:48 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 05:49:09 2008''

Revision as of 02:49, 28 July 2008

Image:1txp.png

Template:STRUCTURE 1txp

Heterogeneous Nuclear Ribonucleoprotein (hnRNP) C Oligomerization Domain Tetramer

Template:ABSTRACT PUBMED 15936032

About this Structure

1TXP is a Single protein structure of sequence from Homo sapiens. Full experimental information is available from OCA.

Reference

Solution structure of the symmetric coiled coil tetramer formed by the oligomerization domain of hnRNP C: implications for biological function., Whitson SR, LeStourgeon WM, Krezel AM, J Mol Biol. 2005 Jul 8;350(2):319-37. PMID:15936032

Page seeded by OCA on Mon Jul 28 05:49:09 2008

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