Structural highlights
3dhc is a 1 chain structure with sequence from Bactk. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
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| Ligands: | , , |
| Related: | 2a7m, 2r2d, 3dha, 3dhb |
| Gene: | aiiA (BACTK) |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT |
Function
[AHLLA_BACTK] Catalyzes hydrolysis of N-hexanoyl-(S)-homoserine lactone, but not the R-enantiomer. Hydrolyzes short- and long-chain N-acyl homoserine lactones with or without 3-oxo substitution at C3, has maximum activity on C10-AHL.[1]
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
Enzymes capable of hydrolyzing N-acyl- l-homoserine lactones (AHLs) used in some bacterial quorum-sensing pathways are of considerable interest for their ability to block undesirable phenotypes. Most known AHL hydrolases that catalyze ring opening (AHL lactonases) are members of the metallo-beta-lactamase enzyme superfamily and rely on a dinuclear zinc site for catalysis and stability. Here we report the three-dimensional structures of three product complexes formed with the AHL lactonase from Bacillus thuringiensis. Structures of the lactonase bound with two different concentrations of the ring-opened product of N-hexanoyl- l-homoserine lactone are determined at 0.95 and 1.4 A resolution and exhibit different product configurations. A structure of the ring-opened product of the non-natural N-hexanoyl- l-homocysteine thiolactone at 1.3 A resolution is also determined. On the basis of these product-bound structures, a substrate-binding model is presented that differs from previous proposals. Additionally, the proximity of the product to active-site residues and observed changes in protein conformation and metal coordination provide insight into the catalytic mechanism of this quorum-quenching metalloenzyme.
Mechanism of the quorum-quenching lactonase (AiiA) from Bacillus thuringiensis. 1. Product-bound structures.,Liu D, Momb J, Thomas PW, Moulin A, Petsko GA, Fast W, Ringe D Biochemistry. 2008 Jul 22;47(29):7706-14. PMID:18627129[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Kim MH, Choi WC, Kang HO, Lee JS, Kang BS, Kim KJ, Derewenda ZS, Oh TK, Lee CH, Lee JK. The molecular structure and catalytic mechanism of a quorum-quenching N-acyl-L-homoserine lactone hydrolase. Proc Natl Acad Sci U S A. 2005 Dec 6;102(49):17606-11. Epub 2005 Nov 28. PMID:16314577
- ↑ Liu D, Momb J, Thomas PW, Moulin A, Petsko GA, Fast W, Ringe D. Mechanism of the quorum-quenching lactonase (AiiA) from Bacillus thuringiensis. 1. Product-bound structures. Biochemistry. 2008 Jul 22;47(29):7706-14. PMID:18627129 doi:10.1021/bi800368y
