Figure 5.
Figure 5 Coordination of the Mg2+ ion in wild-type Kar3. The
bound Mg2+ of wild-type Kar3 has a tetragonal bipyramidal or
octahedral coordination due to the P[ ]oxygen,
the hydroxyl group of T481 and four water molecules that also
interact with D626 of switch II (cyan), R585 and T587 of loop
L9, and N593 of helix 3a.
R585 is hydrogen bonded by a water molecule to the D626 side
chain that interacts with the Mg2+.
The above figure is reprinted
from an Open Access publication published by Macmillan Publishers Ltd:
EMBO J
(2001,
20,
2611-2618)
copyright 2001.
]oxygen,
the hydroxyl group of T481 and four water molecules that also
interact with D626 of switch II (cyan), R585 and T587 of loop
L9, and N593 of helix 
3a.
R585 is hydrogen bonded by a water molecule to the D626 side
chain that interacts with the Mg2+.