3hkb | pdb_00003hkb

Tubulin: RB3 Stathmin-like domain complex

spinqualitylabelsall models 3hkb, resolution 3.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3hkb is a 5 chain structure with sequence from Buffalo rat and Ovis aries. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GDP, GTP, MG Related: 1sa0, 1sa1, 3hkc, 3hkd, 3hke Gene: Stmn4 (Buffalo rat) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [STMN4_RAT] Exhibits microtubule-destabilizing activity. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Structural changes occur in the alphabeta-tubulin heterodimer during the microtubule assembly/disassembly cycle. Their most prominent feature is a transition from a straight, microtubular structure to a curved structure. There is a broad range of small molecule compounds that disturbs the microtubule cycle, a class of which targets the colchicine-binding site and prevents microtubule assembly. This class includes compounds with very different chemical structures, and it is presently unknown whether they prevent tubulin polymerization by the same mechanism. To address this issue, we have determined the structures of tubulin complexed with a set of such ligands and show that they interfere with several of the movements of tubulin subunits structural elements upon its transition from curved to straight. We also determined the structure of tubulin unliganded at the colchicine site; this reveals that a beta-tubulin loop (termed T7) flips into this site. As with colchicine site ligands, this prevents a helix which is at the interface with alpha-tubulin from stacking onto a beta-tubulin beta sheet as in straight protofilaments. Whereas in the presence of these ligands the interference with microtubule assembly gets frozen, by flipping in and out the beta-subunit T7 loop participates in a reversible way in the resistance to straightening that opposes microtubule assembly. Our results suggest that it thereby contributes to microtubule dynamic instability. Variations in the colchicine-binding domain provide insight into the structural switch of tubulin.,Dorleans A, Gigant B, Ravelli RB, Mailliet P, Mikol V, Knossow M Proc Natl Acad Sci U S A. 2009 Aug 18;106(33):13775-9. Epub 2009 Aug 5. PMID:19666559 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Stathmin-4 3D structures Tubulin 3D Structures

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