1sl8

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Calcium-loaded apo-aequorin from Aequorea victoria

Structural highlights

1sl8 is a 1 chain structure with sequence from Aequorea victoria. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.7Å
Ligands:CA
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT, TOPSAN

Function

AEQ1_AEQVI Ca(2+)-dependent bioluminescence photoprotein. Displays an emission peak at 470 nm (blue light). Trace amounts of calcium ion trigger the intramolecular oxidation of the chromophore, coelenterazine into coelenteramide and CO(2) with the concomitant emission of light.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

The crystal structures of calcium-loaded apo-aequorin and apo-obelin have been determined at resolutions 1.7A and 2.2 A, respectively. A calcium ion is observed in each of the three EF-hand loops that have the canonical calcium-binding sequence, and each is coordinated in the characteristic pentagonal bipyramidal configuration. The calcium-loaded apo-protein retain the same compact scaffold and overall fold as the unreacted photoproteins containing the bound substrate, 2-hyroperoxycoelenterazine, and also the same as the Ca2+-discharged obelin bound with product, coleneteramide. Nevertheless, there are easily discerned shifts in both helix and loop regions, and the shifts are not the same between the two proteins. It is suggested that these photoproteins to sense Ca2+ concentration transients and to produce their bioluminescence response on the millisecond timescale. A mechanism of intrastructural transmission of the calcium signal is proposed.

All three Ca2+-binding loops of photoproteins bind calcium ions: the crystal structures of calcium-loaded apo-aequorin and apo-obelin.,Deng L, Vysotski ES, Markova SV, Liu ZJ, Lee J, Rose J, Wang BC Protein Sci. 2005 Mar;14(3):663-75. Epub 2005 Feb 2. PMID:15689515[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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Citations
4 reviews cite this structure
Coelenterazine-dependent luciferases.
Markova et al. (2015)
3 more
40 other articles
No citations found

References

  1. ↑ Deng L, Vysotski ES, Markova SV, Liu ZJ, Lee J, Rose J, Wang BC. All three Ca2+-binding loops of photoproteins bind calcium ions: the crystal structures of calcium-loaded apo-aequorin and apo-obelin. Protein Sci. 2005 Mar;14(3):663-75. Epub 2005 Feb 2. PMID:15689515 doi:10.1110/ps.041142905

Contents


PDB ID 1sl8

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