5hnx

<StructureSection load='5hnx' size='340' side='right' caption='[[5hnx]], [[Resolution|resolution]] 6.60&Aring;' scene=''>

<table><tr><td colspan='2'>[[5hnx]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/ ] and [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5HNX OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5HNX FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GDP:GUANOSINE-5-DIPHOSPHATE'>GDP</scene>, <scene name='pdbligand=GTP:GUANOSINE-5-TRIPHOSPHATE'>GTP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=TA1:TAXOL'>TA1</scene></td></tr>

<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5hnw|5hnw]], [[5hny|5hny]], [[5hnz|5hnz]]</td></tr>

<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5hnx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5hnx OCA], [http://pdbe.org/5hnx PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5hnx RCSB], [http://www.ebi.ac.uk/pdbsum/5hnx PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5hnx ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/TBA1B_BOVIN TBA1B_BOVIN]] Tubulin is the major constituent of microtubules. It binds two moles of GTP, one at an exchangeable site on the beta chain and one at a non-exchangeable site on the alpha chain. [[http://www.uniprot.org/uniprot/NCD_DROME NCD_DROME]] NCD is required for normal chromosomal segregation in meiosis, in females, and in early mitotic divisions of the embryo. The NCD motor activity is directed toward the microtubule's minus end.<ref>PMID:2146510</ref> [[http://www.uniprot.org/uniprot/TBB2B_BOVIN TBB2B_BOVIN]] Tubulin is the major constituent of microtubules. It binds two moles of GTP, one at an exchangeable site on the beta chain and one at a non-exchangeable site on the alpha chain (By similarity).

Kinesin-14 is a unique minus-end-directed microtubule-based motor. A swinging motion of a class-specific N-terminal neck helix has been proposed to produce minus-end directionality. However, it is unclear how swinging of the neck helix is driven by ATP hydrolysis utilizing the highly conserved catalytic core among all kinesins. Here, using a motility assay, we show that in addition to the neck helix, the conserved five residues at the C-terminal region in kinesin-14, namely the neck mimic, are necessary to give kinesin-1 an ability to reverse its directionality toward the minus end of microtubules. Our structural analyses further demonstrate that the C-terminal neck mimic, in cooperation with conformational changes in the catalytic core during ATP binding, forms a kinesin-14 bundle with the N-terminal neck helix to swing toward the minus end of microtubules. Thus, the neck mimic plays a crucial role in coupling the chemical ATPase reaction with the mechanical cycle to produce the minus-end-directed motility of kinesin-14.

 

== References ==

</StructureSection>

[[Category: Kikkawa, M]]

[[Category: Nitta, R]]

[[Category: Shigematsu, H]]

[[Category: Shirouzu, M]]

[[Category: Yokoyama, T]]

[[Category: Atpase]]

[[Category: Kinesin]]

[[Category: Kinesin-14]]

[[Category: Structural protein-motor protein complex]]