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A complex salt bridge in a halophilic malate dehydrogenase This is a dimeric enzyme. One subunit is colored cyan and one is colored magenta. An Arg from one subunit is ion-paired with two different Asp residues: one from the same subunit (4 residues away along an alpha helix) and one from the other subunit. Four possible H-bonds are shown in yellow (They are chosen on the basis of distance. All are less than 4 Å.) Structural features that stabilize halophilic malate dehydrogenase from an archaebacterium.
(PubMed) 1hlp (PDB) |
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