1lvk: Difference between revisions
New page: left|200px<br /><applet load="1lvk" size="450" color="white" frame="true" align="right" spinBox="true" caption="1lvk, resolution 1.9Å" /> '''X-RAY CRYSTAL STRUCTU... |
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[[Image:1lvk.gif|left|200px]]<br /><applet load="1lvk" size=" | [[Image:1lvk.gif|left|200px]]<br /><applet load="1lvk" size="350" color="white" frame="true" align="right" spinBox="true" | ||
caption="1lvk, resolution 1.9Å" /> | caption="1lvk, resolution 1.9Å" /> | ||
'''X-RAY CRYSTAL STRUCTURE OF THE MG (DOT) 2'(3')-O-(N-METHYLANTHRANILOYL) NUCLEOTIDE BOUND TO DICTYOSTELIUM DISCOIDEUM MYOSIN MOTOR DOMAIN'''<br /> | '''X-RAY CRYSTAL STRUCTURE OF THE MG (DOT) 2'(3')-O-(N-METHYLANTHRANILOYL) NUCLEOTIDE BOUND TO DICTYOSTELIUM DISCOIDEUM MYOSIN MOTOR DOMAIN'''<br /> | ||
==Overview== | ==Overview== | ||
Mant (2'(3')-O-(N-methylanthraniloyl)) labeled nucleotides have proven to | Mant (2'(3')-O-(N-methylanthraniloyl)) labeled nucleotides have proven to be useful tools in the study of the kinetic mechanism of the myosin ATPase by fluorescence spectroscopy. The sensitivity of the mant fluorophore to its local environment also makes it suitable to investigate the exposure of bound nucleotides to solvent from collisional quenching measurements. Here we present the crystal structure of mant-ADP and beryllium fluoride complexed with Dictyostelium discoideum myosin motor domain (S1dC) at 1.9 A resolution. We complement the structural approach with an investigation of the accessibility of the mant moiety to solvent using acrylamide quenching of fluorescence emission. In contrast to rabbit skeletal myosin subfragment 1, where the mant group is protected from acrylamide (Ksv=0.2 M-1), the fluorophore is relatively exposed when bound to Dictyostelium myosin motor domain (Ksv= 1.4 M-1). Differences between the Dictyostelium structure and that of vertebrate skeletal subfragment 1, in the region of the nucleotide binding pocket, are proposed as an explanation for the differences observed in the solvent accessibility of complexed mant-nucleotides. We conclude that protection of the mant group from acrylamide quenching does not report on overall closure of the nucleotide binding pocket but reflects more local structural changes. | ||
==About this Structure== | ==About this Structure== | ||
1LVK is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Dictyostelium_discoideum Dictyostelium discoideum] with MG, MNT and BEF as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http:// | 1LVK is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Dictyostelium_discoideum Dictyostelium discoideum] with <scene name='pdbligand=MG:'>MG</scene>, <scene name='pdbligand=MNT:'>MNT</scene> and <scene name='pdbligand=BEF:'>BEF</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LVK OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Dictyostelium discoideum]] | [[Category: Dictyostelium discoideum]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Bagshaw, C | [[Category: Bagshaw, C R.]] | ||
[[Category: Bauer, C | [[Category: Bauer, C B.]] | ||
[[Category: Kuhlman, P | [[Category: Kuhlman, P A.]] | ||
[[Category: Rayment, I.]] | [[Category: Rayment, I.]] | ||
[[Category: BEF]] | [[Category: BEF]] | ||
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[[Category: myosin]] | [[Category: myosin]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:48:50 2008'' | ||
Revision as of 14:48, 21 February 2008
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X-RAY CRYSTAL STRUCTURE OF THE MG (DOT) 2'(3')-O-(N-METHYLANTHRANILOYL) NUCLEOTIDE BOUND TO DICTYOSTELIUM DISCOIDEUM MYOSIN MOTOR DOMAIN
OverviewOverview
Mant (2'(3')-O-(N-methylanthraniloyl)) labeled nucleotides have proven to be useful tools in the study of the kinetic mechanism of the myosin ATPase by fluorescence spectroscopy. The sensitivity of the mant fluorophore to its local environment also makes it suitable to investigate the exposure of bound nucleotides to solvent from collisional quenching measurements. Here we present the crystal structure of mant-ADP and beryllium fluoride complexed with Dictyostelium discoideum myosin motor domain (S1dC) at 1.9 A resolution. We complement the structural approach with an investigation of the accessibility of the mant moiety to solvent using acrylamide quenching of fluorescence emission. In contrast to rabbit skeletal myosin subfragment 1, where the mant group is protected from acrylamide (Ksv=0.2 M-1), the fluorophore is relatively exposed when bound to Dictyostelium myosin motor domain (Ksv= 1.4 M-1). Differences between the Dictyostelium structure and that of vertebrate skeletal subfragment 1, in the region of the nucleotide binding pocket, are proposed as an explanation for the differences observed in the solvent accessibility of complexed mant-nucleotides. We conclude that protection of the mant group from acrylamide quenching does not report on overall closure of the nucleotide binding pocket but reflects more local structural changes.
About this StructureAbout this Structure
1LVK is a Single protein structure of sequence from Dictyostelium discoideum with , and as ligands. Full crystallographic information is available from OCA.
ReferenceReference
X-ray crystal structure and solution fluorescence characterization of Mg.2'(3')-O-(N-methylanthraniloyl) nucleotides bound to the Dictyostelium discoideum myosin motor domain., Bauer CB, Kuhlman PA, Bagshaw CR, Rayment I, J Mol Biol. 1997 Dec 5;274(3):394-407. PMID:9405148
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