1ojr | pdb_00001ojr

L-rhamnulose-1-phosphate aldolase from Escherichia coli (mutant E192A)

spinqualitylabelsall models 1ojr, resolution 1.35Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ojr is a 1 chain structure with sequence from "bacillus_coli"_migula_1895 "bacillus coli" migula 1895. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: 2HA, DIO, GOL, PO4, ZN Related: 1gt7 Activity: Rhamnulose-1-phosphate aldolase, with EC number 4.1.2.19 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [RHAD_ECOLI] Catalyzes the reversible cleavage of L-rhamnulose-1-phosphate to dihydroxyacetone phosphate (DHAP) and L-lactaldehyde.[HAMAP-Rule:MF_00770] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The structure of L-rhamnulose-1-phosphate aldolase has been established at 1.35 A resolution in a crystal form that was obtained by a surface mutation and has one subunit of the C(4)-symmetric tetramer in the asymmetric unit. It confirms an earlier 2.7 A resolution structure which was determined in a complicated crystal form with 20 subunits per asymmetric unit. The chain fold and the active center are similar to those of L-fuculose-1-phosphate aldolase and L-ribulose-5-phosphate 4-epimerase. The active center similarity is supported by a structural comparison of all three enzymes and by the binding mode of the inhibitor phosphoglycolohydroxamate at the site of the product dihydroxyacetone phosphate for the two aldolases. The sensitivity of the catalytic rate to several mutations and a comparison with the established mechanism of the related aldolase give rise to a putative catalytic mechanism. This mechanism involves the same binding mode of the second product L-lactaldehyde in both aldolases, except for a 180 degrees flip of the aldehyde group distinguishing between the two epimers rhamnulose and fuculose. The N-terminal domain exhibits a correlated anisotropic mobility that channels the isotropic Brownian motion into a directed movement of the catalytic base and the substrate phosphate on the N-domain toward the zinc ion and the lactaldehyde on the C-terminal domain. We suggest that this movement supports the catalysis mechanically. Structure and catalytic mechanism of L-rhamnulose-1-phosphate aldolase.,Kroemer M, Merkel I, Schulz GE Biochemistry. 2003 Sep 16;42(36):10560-8. PMID:12962479 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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