1ml1

PROTEIN ENGINEERING WITH MONOMERIC TRIOSEPHOSPHATE ISOMERASE: THE MODELLING AND STRUCTURE VERIFICATION OF A SEVEN RESIDUE LOOP

spinqualitylabelsall models 1ml1, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ml1 is a 6 chain structure with sequence from Trypanosoma brucei brucei. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.6Å Ligands: PGA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function TPIS_TRYBB 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 Protein engineering experiments have been carried out with loop-1 of monomeric triosephosphate isomerase (monoTIM). Loop-1 of monoTIM is disordered in every crystal structure of liganded monoTIM, but in the wild-type TIM it is a very rigid dimer interface loop. This loop connects the first beta-strand with the first alpha-helix of the TIM-barrel scaffold. The first residue of this loop, Lys13, is a conserved catalytic residue. The protein design studies with loop-1 were aimed at rigidifying this loop such that the Lys13 side chain points in the same direction as seen in wild type. The modelling suggested that the loop should be made one residue shorter. With the modelling package ICM the optimal sequence of a new seven-residue loop-1 was determined and its structure was predicted. The new variant could be expressed and purified and has been characterized. The catalytic activity and stability are very similar to those of monoTIM. The crystal structure (at 2.6 A resolution) shows that the experimental loop-1 structure agrees well with the modelled loop-1 structure. The direct superposition of the seven loop residues of the modelled and experimental structures results in an r.m.s. difference of 0.5 A for the 28 main chain atoms. The good agreement between the predicted structure and the crystal structure shows that the described modelling protocol can be used successfully for the reliable prediction of loop structures. Protein engineering with monomeric triosephosphate isomerase (monoTIM): the modelling and structure verification of a seven-residue loop.,Thanki N, Zeelen JP, Mathieu M, Jaenicke R, Abagyan RA, Wierenga RK, Schliebs W Protein Eng. 1997 Feb;10(2):159-67. PMID:9089815 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Triose phosphate isomerase 3D structures

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