1KEG

Antibody 64M-2 Fab complexed with dTT(6-4)TT

Summary for 1KEG

• Entry DOI: 10.2210/pdb1keg/pdb
• Related: 1EHL
• Descriptor: 5'-D(*TP*(64T)P*TP*T)-3', Anti-(6-4) photoproduct antibody 64M-2 Fab (light chain), Anti-(6-4) photoproduct antibody 64M-2 Fab (heavy chain), ... (5 entities in total)
• Functional Keywords: protein-dna complex, dna photoproduct, immunoglobulin, immune system-dna complex, immune system/dna
• Biological source: Mus musculus (mouse); More
• Total number of polymer chains: 3
• Total formula weight: 48690.40

Authors

Yokoyama, H.,Mizutani, R.,Satow, Y.,Sato, K.,Komatsu, Y.,Ohtsuka, E.,Nikaido, O. (deposition date: 2001-11-15, release date: 2002-11-15, Last modification date: 2024-11-20)

Primary citation

Yokoyama, H.,Mizutani, R.,Satow, Y.,Sato, K.,Komatsu, Y.,Ohtsuka, E.,Nikaido, O.
Structure of the DNA (6-4) photoproduct dTT(6-4)TT in complex with the 64M-2 antibody Fab fragment implies increased antibody-binding affinity by the flanking nucleotides.
Acta Crystallogr.,Sect.D, 68:232-238, 2012

PubMed Abstract: Pyrimidine (6-4) pyrimidone DNA photoproducts produced by ultraviolet light are highly mutagenic and carcinogenic. The crystal structure of the dTT(6-4)TT photoproduct in complex with the Fab fragment of the antibody 64M-2 that is specific for (6-4) photoproducts was determined at 2.4 Å resolution. The dT(6-4)T segment is fully accommodated in the concave binding pocket of the Fab, as observed in the complex of dT(6-4)T with the Fab. The pyrimidine and pyrimidone bases of the dT(6-4)T segment are positioned nearly perpendicularly to each other. The thymidine segments flanking both ends extend away from the dT(6-4)T segment. The 5'-side thymine base is parallel to the side chain of Tyr100iH of the antibody heavy chain and is also involved in electrostatic interactions with Asn30L, Tyr32L and Lys50L of the antibody light chain. The 5'-side and 3'-side phosphate groups exhibit electrostatic interactions with Asn28L and Ser58H, respectively. These interactions with the flanking nucleotides explain why longer oligonucleotides containing dT(6-4)T segments in the centre show higher antibody-binding affinities than the dT(6-4)T ligand.

PubMed: 22349224
DOI: 10.1107/S0907444912000327

Experimental method

X-RAY DIFFRACTION (2.4 Å)