4mn0 | pdb_00004mn0

Spatial structure of the novel light-sensitive photoprotein berovin from the ctenophore Beroe abyssicola in the Ca2+-loaded apoprotein conformation state

spinqualitylabelsall models 4mn0, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4mn0 is a 1 chain structure with sequence from Berab. This structure supersedes the now removed PDB entry 2hpk. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, MG NonStd Res: MSE Gene: BA2, BA1, BA3, BA4 (BERAB) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The bright bioluminescence of ctenophores, found in oceans worldwide, is determined by Ca(2+)-regulated photoproteins, functionally identical to and sharing many properties of hydromedusan photoproteins. In contrast, however, the ctenophore photoproteins are extremely sensitive to UV and visible light over the range of their absorption spectrum. The spatial structure of a novel light-sensitive photoprotein from the ctenophore Beroe abyssicola in its apoform bound with three calcium ions is determined at 2.0A. We demonstrate that the apoberovin is a slightly asymmetrical compact globular protein formed by two domains with a cavity in the center, which exactly retains the fold architecture characteristic of hydromedusan photoproteins despite their low amino acid sequence identity. However, the structural alignment of these two photoprotein classes clearly shows that despite the high similarity of shape and geometry of their coelenterazine-binding cavities, their interiors differ drastically. The key residues appearing to be crucial for stabilizing the 2-hydroperoxycoelenterazine and for formation of the emitter in hydromedusan photoproteins, are replaced in berovin by amino acid residues having completely different side chain properties. Evidently, these replacements must be responsible for the distinct properties of ctenophore photoproteins such as sensitivity to light or the fact that the formation of active photoprotein from apophotoprotein, coelenterazine, and oxygen is more effective at alkaline pH. Spatial structure of the novel light-sensitive photoprotein berovin from the ctenophore Beroe abyssicola in the Ca(2+)-loaded apoprotein conformation state.,Stepanyuk GA, Liu ZJ, Burakova LP, Lee J, Rose J, Vysotski ES, Wang BC Biochim Biophys Acta. 2013 Oct;1834(10):2139-46. doi:, 10.1016/j.bbapap.2013.07.006. Epub 2013 Jul 25. PMID:23891746 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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