Premium
Structure of the Ca 2+ ‐regulated photoprotein obelin at 1.7 Å resolution determined directly from its sulfur substructure
Author(s) -
Liu ZhiJie,
Vysotski Eugene S.,
Vysotski Eugene S.,
Chen ChunJung,
Rose John P.,
Lee John,
Wang BiCheng
Publication year - 2000
Publication title -
protein science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.353
H-Index - 175
eISSN - 1469-896X
pISSN - 0961-8368
DOI - 10.1110/ps.9.11.2085
Subject(s) - photoprotein , chemistry , crystal structure , crystallography , substructure , bioluminescence , aequorin , stereochemistry , calcium , biochemistry , structural engineering , organic chemistry , engineering
The crystal structure of the photoprotein obelin (22.2 kDa) from Obelia longissima has been determined and refined to 1.7 Å resolution. Contrary to the prediction of a peroxide, the noncovalently bound substrate, coelenterazine, has only a single oxygen atom bound at the C2‐position. The protein‐coelenterazine 2‐oxy complex observed in the crystals is photo‐active because, in the presence of calcium ion, bioluminescence emission within the crystal is observed. This structure represents only the second de novo protein structure determined using the anomalous scattering signal of the sulfur substructure in the crystal. The method used here is theoretically different from that used for crambin in 1981 (4.72 kDa) and represents a significant advancement in protein crystal structure determination.