Download MendeleyThe 1.8-A crystal structure of alpha1-acid glycoprotein (Orosomucoid) solved by UV RIP reveals the broad drug-binding activity of this human plasma lipocalin.
Schonfeld, D.L., Ravelli, R.B., Mueller, U., Skerra, A.(2008) J Mol Biol 384: 393-405
- PubMed: 18823996
- DOI: https://doi.org/10.1016/j.jmb.2008.09.020
- Primary Citation of Related Structures:
3KQ0 - PubMed Abstract:
Alpha(1)-acid glycoprotein (AGP) is an important drug-binding protein in human plasma and, as an acute-phase protein, it has a strong influence on pharmacokinetics and pharmacodynamics of many pharmaceuticals. We report the crystal structure of the recombinant unglycosylated human AGP at 1.8 A resolution, which was solved using the new method of UV-radiation-damage-induced phasing (UV RIP). AGP reveals a typical lipocalin fold comprising an eight-stranded beta-barrel. Of the four loops that form the entrance to the ligand-binding site, loop 1, which connects beta-strands A and B, is among the longest observed so far and exhibits two full turns of an alpha-helix. Furthermore, it carries one of the five N-linked glycosylation sites, while a second one occurs underneath the tip of loop 2. The branched, partly hydrophobic, and partly acidic cavity, together with the presumably flexible loop 1 and the two sugar side chains at its entrance, explains the diverse ligand spectrum of AGP, which is known to vary with changes in glycosylation pattern.
Organizational Affiliation:
Lehrstuhl für Biologische Chemie, Technische Universität München, An der Saatzucht 5, 85350 Freising-Weihenstephan, Germany.
