1dlf
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(New page: 200px<br /> <applet load="1dlf" size="450" color="white" frame="true" align="right" spinBox="true" caption="1dlf, resolution 1.45Å" /> '''HIGH RESOLUTION CRY...)
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Revision as of 07:21, 18 November 2007
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HIGH RESOLUTION CRYSTAL STRUCTURE OF THE FV FRAGMENT FROM AN ANTI-DANSYL SWITCH VARIANT ANTIBODY IGG2A(S) CRYSTALLIZED AT PH 5.25
Overview
The Fv fragment from an anti-dansyl antibody was optimally crystallized, into two crystal forms having slightly different lattice dimensions at pH, 5.25 and 6.75. The two crystal structures were determined and refined at, high resolution at 112 K (at 1.45 A for the crystal at pH 5.25 and at 1.55, A for that at pH 6.75). In the two crystal structures, marked differences, were identified in the first half of CDRH3 s having an amino acid sequence, of Ile95H-Tyr96H-Tyr97H-His98H-Tyr99H-Pro1 00H-Trp100aH-Phe100bH-Ala101H-, Tyr102H. NMR pH titration experiments revealed the p Kavalues of four, histidine residues (His27dL, His93L, His55H and His98H) exposed to, solvent. Only His98H (p Ka=6.3) completely changed its protonation state, between the two crystallization conditions. In addition, the environmental, structures including hydration water molecules around the four histidine, residues were carefully compared. While the hydration structures around, His27dL, His93L and His55H were almost invariant between the two crystal, structures, those around His98Hs showed great difference in spite of the, small conformational difference of His98H between the two crystal, structures. These spectroscopic and crystallographic findings suggested, that the change in the protonation state in His98H was responsible for the, structural differences between pH 5.25 and 6.75. In addition, the most, plausible binding site of the dansyl group was mapped into the present, structural models with our previous NMR experimental results. The, complementarity-determining regions H1, H3 and the N-terminal region in, the VH domain formed the site. The side-chain of Tyr96H occupied the site, and interacted with Phe27H of H1, giving a clue for the binding mode of, the dansyl group in the site.
About this Structure
1DLF is a Protein complex structure of sequences from Mus musculus with SO4 as ligand. Full crystallographic information is available from OCA.
Reference
The pH-dependent structural variation of complementarity-determining region H3 in the crystal structures of the Fv fragment from an anti-dansyl monoclonal antibody., Nakasako M, Takahashi H, Shimba N, Shimada I, Arata Y, J Mol Biol. 1999 Aug 6;291(1):117-34. PMID:10438610
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