2f8p Summary

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Crystal structure of obelin following Ca2+ triggered bioluminescence suggests neutral coelenteramide as the primary excited state

The structure was published by Liu, Z.J., Stepanyuk, G.A., Vysotski, E.S., et al., Markova, S.V., Malikova, N.P., and Wang, B.C., in 2006 in a paper entitled "Crystal structure of obelin after Ca2+-triggered bioluminescence suggests neutral coelenteramide as the primary excited state." (abstract).

This crystal structure was determined using X-ray diffraction at a resolution of 1.93 Å and deposited in 2005.

The experimental data on which the structure is based was also deposited.

The PDB entry contains the structure of Obelin. This molecule has the UniProt identifier Q27709 (OBL_OBELO)search. The sample contained 195 residues which is 100% of the natural sequence. Out of 195 residues 190 were observed and are deposited in the PDB.

It also contains one or more heterogenic compounds (e.g., ligands, co-factors, ions, modified amino acids, etc.); see here for a complete list.

The molecule is most likely monomeric.

The following tables show cross-reference information to other databases (to obtain a list of all PDB entries sharing the same property or classification, click on the magnifying glass icon):


Chain Name UniProt Name of source organism % of UniProt sequence present in the sample Residues in the sample molecules % of residues observed
A Obelin Q27709 (1-195) (OBL_OBELO)search Obelia longissimasearch 100% 195 97%


This entry contains 1 unique UniProt protein:

UniProt accession Name Organism PDB
Q27709 (1 - 195) Obelin Obelia longissima

Chain Structural classification (CATH) Sequence family (Pfam)
A (Q27709) EF-handsearch PF13405: EF-hand domainsearch, PF13499: EF-hand domain pairsearch

Chain ID Molecular function (GO) Biological process (GO)
A (Q27709) metal ion bindingsearch calcium ion bindingsearch bioluminescencesearch

Chain InterPro annotation
A EF-hand domainsearch EF-hand domain pairsearch EF-Hand 1, calcium-binding sitesearch