Heterologous expression of a Photorhabdus luminescens syrbactin-like gene cluster results in production of the potent proteasome inhibitor glidobactin A.
Syrbactins are cyclic peptide derivatives which are known to inhibit the eukaryotic proteasome by irreversible covalent binding to its catalytic sites. The only two members of this family characterized to date, syringolin A and glidobactin A, are secreted by certain strains of Pseudomonas syringae pv. syringae and strain K481-B101 from the order Burkholderiales, respectively. Syrbactins are the products of mixed non-ribosomal peptide/polyketide synthases encoded by gene clusters with a characteristic architecture. Similar, but not identical gene clusters are present in several other bacterial genomes, including that of Photorhabdus luminescens subsp. laumondii TT01, which is therefore hypothesized to be able to produce a syrbactin-type proteasome inhibitor. Here we report the cloning of the putative syrbactins synthetase encoding gene cluster of Ph. luminescens into a cosmid vector and its heterologous expression in Pseudomonas putida. Analysis of culture supernatants of transformed Ps. putida by HPLC and mass spectrometry revealed the presence of glidobactin A, indicating that the syrbactins-like gene cluster of Ph. luminescens encodes a glidobactin A synthetase and that this organism has the capacity to synthesize glidobactin A.
Institute of Plant Biology, University of Zurich, Zollikerstrasse 107, CH-8008 Zurich, Switzerland.
Alexey
A
Dudnik
Laurent
L
Bigler
Robert
R
Dudler
D003001:Cloning, Molecular; D005810:Multigene Family / Q000235:genetics / Q000502:physiology; D010453:Peptide Synthases / Q000235:genetics / Q000378:metabolism*; D010456:Peptides, Cyclic / Q000096:biosynthesis* / Q000737:chemistry; D020637:Photorhabdus / Q000201:enzymology* / Q000235:genetics; D046988:Proteasome Endopeptidase Complex / Q000378:metabolism; D061988:Proteasome Inhibitors / Q000378:metabolism*; D016958:Pseudomonas putida / Q000201:enzymology / Q000235:genetics*
D010456:Peptides, Cyclic; D061988:Proteasome Inhibitors; C057878:glidobactin A; D046988:Proteasome Endopeptidase Complex; D010453:Peptide Synthases; C104385:non-ribosomal peptide synthase