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Figure 2
The equatorial interactions of PQQ in the active site and the dative bonds that coordinate the calcium. The lengths of the bonds to the Ca2+ ion are all between 2.4 and 2.8 Å. The orthoquinone group is formed by the central six-membered ring with two O-atom substituents. The vicinal disulfide bond formed by cysteines 103 and 104, which packs against the PQQ ring, has been omitted for clarity.

Journal logoBIOLOGICAL
CRYSTALLOGRAPHY
ISSN: 1399-0047
Volume 61| Part 1| December 2005| Pages 75-79
doi:10.1107/S0907444904026964
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