1wqh: Difference between revisions

Revision as of 16:47, 21 February 2008

Crystal structure of ribosome recycling factor from Mycobacterium tuberculosis

OverviewOverview

The crystal structure of Mycobacterium tuberculosis ribosome recycling factor has been determined and refined against three X-ray diffraction data sets, two collected at room temperature and the other at 100K. The two room-temperature data sets differ in the radiation damage suffered by the crystals before the data used for processing were collected. A comparison between the structures refined against the two data sets indicates the possibility of radiation-induced conformational change. The L-shaped molecule is composed of a long three-helix bundle domain (domain I) and a globular domain (domain II) connected by a linker region. The main difference between the room-temperature structure and the low temperature structure is in the rotation of domain II about an axis close to its libration axis. This observation and a detailed comparative study of ribosome recycling factors (RRFs) of known structures led to an elaboration of the present understanding of the structural variability of RRF. The variability involves a change in the angle between the two arms of the molecule, a rotation of domain II in a plane nearly perpendicular to the axis of the helix bundle and an internal rotation of domain II. Furthermore, the domains and the linker could be delineated into fixed and variable regions in a physically meaningful manner. The relative mobility of the domains of the molecule in the crystal structure appears to be similar to that in the ribosome--RRF complex. That permits a meaningful discussion of the structural features of RRF in terms of ribosome--RRF interactions. The structure also provides insights into the results of inter-species complementation studies.

About this StructureAbout this Structure

1WQH is a Single protein structure of sequence from Mycobacterium tuberculosis with as ligand. Full crystallographic information is available from OCA.

ReferenceReference

X-ray structural studies of Mycobacterium tuberculosis RRF and a comparative study of RRFs of known structure. Molecular plasticity and biological implications., Saikrishnan K, Kalapala SK, Varshney U, Vijayan M, J Mol Biol. 2005 Jan 7;345(1):29-38. PMID:15567408

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OCA

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-[[Image:1wqh.gif|left|200px]]<br /><applet load="1wqh" size="450" color="white" frame="true" align="right" spinBox="true"
+[[Image:1wqh.gif|left|200px]]<br /><applet load="1wqh" size="350" color="white" frame="true" align="right" spinBox="true"
 caption="1wqh, resolution 2.90&Aring;" />
 '''Crystal structure of ribosome recycling factor from Mycobacterium tuberculosis'''<br />
 ==Overview==
-The crystal structure of Mycobacterium tuberculosis ribosome recycling, factor has been determined and refined against three X-ray diffraction, data sets, two collected at room temperature and the other at 100K. The, two room-temperature data sets differ in the radiation damage suffered by, the crystals before the data used for processing were collected. A, comparison between the structures refined against the two data sets, indicates the possibility of radiation-induced conformational change. The, L-shaped molecule is composed of a long three-helix bundle domain (domain, I) and a globular domain (domain II) connected by a linker region. The, main difference between the room-temperature structure and the low, temperature structure is in the rotation of domain II about an axis close, to its libration axis. This observation and a detailed comparative study, of ribosome recycling factors (RRFs) of known structures led to an, elaboration of the present understanding of the structural variability of, RRF. The variability involves a change in the angle between the two arms, of the molecule, a rotation of domain II in a plane nearly perpendicular, to the axis of the helix bundle and an internal rotation of domain II., Furthermore, the domains and the linker could be delineated into fixed and, variable regions in a physically meaningful manner. The relative mobility, of the domains of the molecule in the crystal structure appears to be, similar to that in the ribosome--RRF complex. That permits a meaningful, discussion of the structural features of RRF in terms of ribosome--RRF, interactions. The structure also provides insights into the results of, inter-species complementation studies.
+The crystal structure of Mycobacterium tuberculosis ribosome recycling factor has been determined and refined against three X-ray diffraction data sets, two collected at room temperature and the other at 100K. The two room-temperature data sets differ in the radiation damage suffered by the crystals before the data used for processing were collected. A comparison between the structures refined against the two data sets indicates the possibility of radiation-induced conformational change. The L-shaped molecule is composed of a long three-helix bundle domain (domain I) and a globular domain (domain II) connected by a linker region. The main difference between the room-temperature structure and the low temperature structure is in the rotation of domain II about an axis close to its libration axis. This observation and a detailed comparative study of ribosome recycling factors (RRFs) of known structures led to an elaboration of the present understanding of the structural variability of RRF. The variability involves a change in the angle between the two arms of the molecule, a rotation of domain II in a plane nearly perpendicular to the axis of the helix bundle and an internal rotation of domain II. Furthermore, the domains and the linker could be delineated into fixed and variable regions in a physically meaningful manner. The relative mobility of the domains of the molecule in the crystal structure appears to be similar to that in the ribosome--RRF complex. That permits a meaningful discussion of the structural features of RRF in terms of ribosome--RRF interactions. The structure also provides insights into the results of inter-species complementation studies.
 ==About this Structure==
-WQH is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis] with CD as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1WQH OCA].
+WQH is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis] with <scene name='pdbligand=CD:'>CD</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1WQH OCA].
 ==Reference==
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 [[Category: Mycobacterium tuberculosis]]
 [[Category: Single protein]]
-[[Category: Kalapala, S.K.]]
+[[Category: Kalapala, S K.]]
 [[Category: Saikrishnan, K.]]
 [[Category: Varshney, U.]]
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 [[Category: triple-helix bundle]]
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