2V5J: Apo Class Ii Aldolase Hpch

Microorganisms are adept at degrading chemically resistant aromatic compounds. One of the longest and most well characterized aromatic catabolic pathways is the 4-hydroxyphenylacetic acid degradation pathway of Escherichia coli. The final step involves the conversion of 4-hydroxy-2-oxo-heptane-1,7-dioate into pyruvate and succinic semialdehyde. This reaction is catalyzed by 4-hydroxy-2-oxo-heptane-1,7-dioate aldolase (HpcH), a member of the divalent metal ion dependent class II aldolase enzymes that have great biosynthetic potential. We have solved the crystal structure of HpcH in the apo form, and with magnesium and the substrate analogue oxamate bound, to 1.6 A and 2.0 A, respectively. Comparison with similar structures of the homologous 2-dehydro-3-deoxygalactarate aldolase, coupled with site-directed mutagenesis data, implicate histidine 45 and arginine 70 as key catalytic residues.
PDB ID: 2V5JDownload
MMDB ID: 59762
PDB Deposition Date: 2007/7/5
Updated in MMDB: 2012/11
Experimental Method:
x-ray diffraction
Resolution: 1.6  Å
Source Organism:
Similar Structures:
Biological Unit for 2V5J: hexameric; determined by author and by software (PQS)
Molecular Components in 2V5J
Label Count Molecule
Proteins (6 molecules)
2,4-dihydroxyhept-2-ene-1,7-dioic Acid Aldolase
Molecule annotation
Chemicals (21 molecules)
* Click molecule labels to explore molecular sequence information.

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