Sandbox Reserved 814: Difference between revisions
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== Introduction == | == Introduction == | ||
[[Image:L14structure.jpg|175px|left|thumb| Geobacillus stearothermophilus's L14 ribosomal protein structure.]] | [[Image:L14structure.jpg|175px|left|thumb| Geobacillus stearothermophilus's L14 ribosomal protein structure.]] | ||
The L14 ribosomal protein is a protein which is included in the 50S subunit of the procaryote ribosome and in the 60s subunit of the eucaryote ribosome.The L14 ribosomal protein take part in | The L14 ribosomal protein is a protein which is included in the 50S subunit of the procaryote ribosome and in the 60s subunit of the eucaryote ribosome.The L14 ribosomal protein take part in an operon in Procaryotic and on the third human's chromosome. The 50S and 60S subunits are the twos biggest subunits of the prokaryotic and eukaryotic ribosomes. It is a cytoplasmic protein which contains a basic region leucine zipper which participates to the mechanism of translation by allowing the folding and stabilization of rRNA. | ||
The L14 subunit is one of the most conserved protein in the ribosome in a lot species. For example, 66% sequence identity exists between the Escherichia coli and Bacillus stearothermophilus molecules. L14 has been located | The L14 subunit is one of the most conserved protein in the ribosome in a lot of species. For example, 66% sequence identity exists between the Escherichia coli and Bacillus stearothermophilus molecules. L14 has been located on the 50S and 30S subunit interface between peptidyl transferase and GTPase regions. It allows contacts with the 16S rRNA of the 30S subunit (bridges B5 and B8) connecting the 2 subunits. | ||
== Structure == | == Structure == | ||
The L14 subunit has a molecular mass of 13.3 kDa and contains 122 amino acids. The molecule is extremly compact so water molecule are exclude. It belong to α+β class of proteins. It is composed of five stranded <scene name='56/568012/Barrel/1'>beta barrel</scene> : β1-β2-β3-β4-β7 all antiparallel, stabilized by hydrogen-bounding, a C-terminal region which contains the two small <scene name='56/568012/Helix/2'>alpha-helixes</scene> and a beta-ribbon. The beta-barrel contains a hydrophobic core of highly conserved residues : Ala, Leu, Ile, Val, Cys. The beta-barrel is stabilized by some hydrogen-bonding such as a bonding between loop 2 and loops 4 and 8. <scene name='56/568012/Loopstab/1'>Loop 4 interact with the Ser14 of the loop 2 by the residue 51</scene>. | The L14 subunit has a molecular mass of 13.3 kDa and contains 122 amino acids. The molecule is extremly compact so water molecule are exclude. It belong to α+β class of proteins. It is composed of five stranded <scene name='56/568012/Barrel/1'>beta barrel</scene> : β1-β2-β3-β4-β7 all antiparallel, stabilized by hydrogen-bounding, a C-terminal region which contains the two small <scene name='56/568012/Helix/2'>alpha-helixes</scene> and a beta-ribbon : the extended loop8. The beta-barrel contains a hydrophobic core of highly conserved residues : Ala, Leu, Ile, Val, Cys. The beta-barrel is stabilized by some hydrogen-bonding such as a bonding between loop 2 and loops 4 and 8. <scene name='56/568012/Loopstab/1'>Loop 4 interact with the Ser14 of the loop 2 by the residue 51</scene>. The loops 3 which connects β2 and β3 allows to close this end with the hydrophobic side chains. The top of the β-barrel is made with 2 valines 51 and 54 in loop 4. | ||
The loop 2 has an unusual and highly structure turn which contains the most conserved sequence, stabilized by a hydrogen-bonding complex: the alide protons and carbonyl oxygène of 3 residues and a water molecule. The turn allows to stabilize loop 4 and loop 8. Loop8 has several interactions. Finally, three structural waters (206–208) are involved in the stabilization of the local conformation around residue 91 in loop8 and the N terminus of helix α2. | |||
== Bidding sites == | == Bidding sites == | ||
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<Structure load='3cc2' size='300' frame='true' align='center' caption='All ribosomal proteins allow the stabilization of the rRNA.' scene='Insert optional scene name here' /> | <Structure load='3cc2' size='300' frame='true' align='center' caption='All ribosomal proteins allow the stabilization of the rRNA.' scene='Insert optional scene name here' /> | ||
== References == | |||
Christopher Davies, Stephen W White, V Ramakrishnan. The crystal structure of ribosomal protein L14 reveals an important organizational component of the translational apparatus. | |||
L. Mattheakis, L. Vu, F. Sor, M. Nomura ; Octobre 1988. Retroregulation of the synthesis of ribosomal protein L14 and L24 by feedback repressor S8 in Escherichia coli.. | |||
By Bonhomme Clémence and Dilda Nathan</StructureSection><!-- PLEASE DO NOT DELETE THIS TEMPLATE --> | By Bonhomme Clémence and Dilda Nathan</StructureSection><!-- PLEASE DO NOT DELETE THIS TEMPLATE --> | ||
{{Sandbox_Reserved_ESBS}} | {{Sandbox_Reserved_ESBS}} | ||
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