2jb5
|
FAB FRAGMENT IN COMPLEX WITH SMALL MOLECULE HAPTEN, CRYSTAL FORM-1
OverviewOverview
Tetrasulfocyanine (TSC) has been described as a fluorescent probe for tumour imaging. The complex of TSC and the Fab antibody fragment MOR03268 has been crystallized in three different crystal forms. MOR03268 was identified from the HuCAL GOLD library and further optimized to bind TSC with high affinity (Kd = 0.6 nM). For two of the three crystal forms (forms 1 and 2), data sets could be collected to 2.8 and 2.85 A resolution, respectively. Form 1 belongs to space group I222, with unit-cell parameters a = 72, b = 99, c = 154 A. Form 2 belongs to space group P4(3)2(1)2, with unit-cell parameters a = b = 77, c = 379 A. Form 3 only diffracted to 8 A and was not analyzed further. Molecular-replacement solutions for forms 1 and 2 were found and rebuilding and refinement is in progress. Form 1 contains one Fab molecule per asymmetric unit, while form 2 harbours two. Judging from the green colour of the crystals, both forms contain the Fab molecule bound to the green TSC dye and in both the hydrolysis-sensitive dye molecule is protected from degradation for several weeks to months. The structures should reveal the molecular basis of the high-affinity recognition of TSC by the Fab molecule MOR03268.
About this StructureAbout this Structure
2JB5 is a Single protein structure of sequence from Homo sapiens with as ligand. Known structural/functional Site: . Full crystallographic information is available from OCA.
ReferenceReference
Crystallization and molecular-replacement solution of a diagnostic fluorescent dye in complex with a specific Fab fragment., Hillig RC, Baesler S, Urlinger S, Stark Y, Bauer S, Badock V, Huber M, Bahr I, Schirner M, Licha K, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2007 Mar 1;63(Pt, 3):217-23. Epub 2007 Feb 23. PMID:17329818
Page seeded by OCA on Thu Feb 21 18:01:25 2008