1H2B: Crystal Structure of the Alcohol Dehydrogenase from the Hyperthermophilic Archaeon Aeropyrum pernix at 1.65A Resolution

The structure of the recombinant medium chain alcohol dehydrogenase (ADH) from the hyperthermophilic archaeon Aeropyrum pernix has been solved by the multiple anomalous dispersion technique using the signal from the naturally occurring zinc ions. The enzyme is a tetramer with 222 point group symmetry. The ADH monomer is formed from a catalytic and a cofactor-binding domain, with the overall fold similar to previously solved ADH structures. The 1.62 A resolution A.pernix ADH structure is that of the holo form, with the cofactor NADH bound into the cleft between the two domains. The electron density found in the active site has been interpreted to be octanoic acid, which has been shown to be an inhibitor of the enzyme. This inhibitor is positioned with its carbonyl oxygen atom forming the fourth ligand of the catalytic zinc ion. The structural zinc ion of each monomer is present at only partial occupancy and in its absence a disulfide bond is formed. The enhanced thermal stability of the A.pernix ADH is thought to arise primarily from increased ionic and hydrophobic interactions on the subunit interfaces.
PDB ID: 1H2BDownload
MMDB ID: 23953
PDB Deposition Date: 2002/8/2
Updated in MMDB: 2007/10
Experimental Method:
x-ray diffraction
Resolution: 1.62  Å
Source Organism:
Similar Structures:
Biological Unit for 1H2B: tetrameric; determined by author and by software (PQS)
Molecular Components in 1H2B
Label Count Molecule
Proteins (4 molecules)
Alcohol Dehydrogenase
Molecule annotation
Chemicals (18 molecules)
* Click molecule labels to explore molecular sequence information.

Citing MMDB