Atomic resolution structure of obelin: soaking with calcium enhances electron density of the second oxygen atom substituted at the C2-position of coelenterazine.Liu, Z.J., Vysotski, E.S., Deng, L., Lee, J., Rose, J., Wang, B.C.
(2003) Biochem Biophys Res Commun 311: 433-439
- PubMed: 14592432
- DOI: 10.1016/j.bbrc.2003.09.231
- Primary Citation of Related Structures:
- PubMed Abstract:
- Structure of the Ca2+-regulated photoprotein obelin at 1.7 resolution determined directly from its sulfur substructure
Liu, Z.-J., Vysotski, E., Chen, C.-J., Rose, J., Lee, J., Wang, B.-C.
(2000) Protein Sci 9: 2085
- Preparation and preliminary study of crystals of the recombinant calcium-regulated photoprotein obelin from the bioluminescent hydroid Obelia longissima
Vysotski, E., Liu, Z.-J., Rose, J., Wang, B.-C., Lee, J.
(1999) Acta Crystallogr D Biol Crystallogr 55: 1965
- Structural basis for the emission of violet bioluminescence from
a W92F obelin mutant
Deng, L., Vysotski, E., Liu, Z.-J., Markova, S., Malikova, N., Lee, J., Rose, J., Wang, B.-C.
(2001) FEBS Lett 506: 281
- Violet Bioluminescence and Fast Kinetics from W92F Obelin: Structure-Based
Proposals for the Bioluminescence Triggering and the Identification of the Emitting
Vysotski, E., Liu, Z.-J., Markova, S., Blinks, J., Deng, L., Frank, L., Herko, M., Malikova, N., Rose, J., Wang, B.-C., Lee, J.
(2003) Biochemistry 42: 6013
The spatial structure of the Ca(2+)-regulated photoprotein obelin has been solved to resolution of 1.1A. Two oxygen atoms are revealed substituted at the C2-position of the coelenterazine in contrast to the obelin structure at 1.73A resolution where ...
The spatial structure of the Ca(2+)-regulated photoprotein obelin has been solved to resolution of 1.1A. Two oxygen atoms are revealed substituted at the C2-position of the coelenterazine in contrast to the obelin structure at 1.73A resolution where one oxygen atom only was disclosed. The electron density of the second oxygen atom was very weak but after exposing the crystals to a trace of Ca(2+), the electron densities of both oxygen atoms became equally intense. In addition, one Ca(2+) was found bound in the loop of the first EF-hand motif. Four of the ligands were provided by protein residues Asp30, Asn32, Asn34, and the main chain oxygen of Lys36. The other two were from water molecules. From a comparison of B-factors for the residues constituting the active site, it is suggested that the variable electron densities observed in various photoprotein structures could be attributed to different mobilities of the peroxy oxygen atoms.
Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA 30602, USA.