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PDBsum entry 1bdb
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Oxidoreductase
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PDB id
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1bdb
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References listed in PDB file
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Key reference
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Title
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Crystal structure of cis-Biphenyl-2,3-Dihydrodiol-2,3-Dehydrogenase from a pcb degrader at 2.0 a resolution.
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Authors
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M.Hülsmeyer,
H.J.Hecht,
K.Niefind,
B.Hofer,
L.D.Eltis,
K.N.Timmis,
D.Schomburg.
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Ref.
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Protein Sci, 1998,
7,
1286-1293.
[DOI no: ]
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PubMed id
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Abstract
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cis-Biphenyl-2,3-dihydrodiol-2,3-dehydrogenase (BphB) is involved in the aerobic
biodegradation of polychlorinated biphenyls (PCBs). The crystal structure of the
NAD+-enzyme complex was determined by molecular replacement and refined to an
R-value of 17.9% at 2.0 A. As a member of the short-chain alcohol
dehydrogenase/reductase (SDR) family, the overall protein fold and positioning
of the catalytic triad in BphB are very similar to those observed in other SDR
enzymes, although small differences occur in the cofactor binding site. Modeling
studies indicate that the substrate is bound in a deep hydrophobic cleft close
to the nicotinamide moiety of the NAD+ cofactor. These studies further suggest
that Asn143 is a key determinant of substrate specificity. A two-step reaction
mechanism is proposed for cis-dihydrodiol dehydrogenases.
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Figure 5.
Fig. 5. Stereoscopic view f the active site withelectrondensitycontoured at Thedockedsubstrate BPDD (ontheright)hasbeen
incorporated to thepicture.
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Figure 7.
Fig. 7. Proposed reaction mechanism.
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The above figures are
reprinted
from an Open Access publication published by the Protein Society:
Protein Sci
(1998,
7,
1286-1293)
copyright 1998.
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Secondary reference #1
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Title
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Genetic analysis of a pseudomonas locus encoding a pathway for biphenyl/polychlorinated biphenyl degradation.
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Authors
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B.Hofer,
L.D.Eltis,
D.N.Dowling,
K.N.Timmis.
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Ref.
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Gene, 1993,
130,
47-55.
[DOI no: ]
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PubMed id
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