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Antimicrobial Agents and Chemotherapy, July 1999, p. 1565-1573, Vol. 43, No. 7
0066-4804/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Identification and Analysis of the Balhimycin
Biosynthetic Gene Cluster and Its Use for Manipulating
Glycopeptide Biosynthesis in Amycolatopsis
mediterranei DSM5908
S.
Pelzer,1
R.
Süßmuth,2
D.
Heckmann,1,
J.
Recktenwald,1
P.
Huber,1
G.
Jung,2 and
W.
Wohlleben1,*
Mikrobiologie/Biotechnologie1
and Institut für Organische
Chemie,2 Eberhard-Karls-Universität
Tübingen, D-72076 Tübingen, Germany
Received 30 November 1998/Returned for modification 22 March
1999/Accepted 9 April 1999
Seven complete genes and one incomplete gene for the biosynthesis
of the glycopeptide antibiotic balhimycin were isolated from the
producer, Amycolatopsis mediterranei DSM5908, by a
reverse-cloning approach and characterized. Using oligonucleotides
derived from glycosyltransferase sequences, a 900-bp
glycosyltransferase gene fragment was amplified and used to identify a
DNA fragment of 9,882 bp. Of the identified open reading frames, three
(oxyA to -C) showed significant sequence
similarities to cytochrome P450 monooxygenases and one
(bhaA) showed similarities to halogenase, and the genes
bgtfA to -C showed similarities to
glycosyltransferases. Glycopeptide biosynthetic mutants were created by
gene inactivation experiments eliminating oxygenase and
glycosyltransferase functions. Inactivation of the oxygenase gene(s)
resulted in a balhimycin mutant (SP1-1) which was not able to
synthesize an antibiotically active compound. Structural analysis by
high-performance liquid chromatography-mass spectrometry,
fragmentation studies, and amino acid analysis demonstrated that these
oxygenases are involved in the coupling of the aromatic side chains of
the unusual heptapeptide. Mutant strain HD1, created by inactivation of
the glycosyltransferase gene bgtfB, produced at least four
different compounds which were not glycosylated but still
antibiotically active.
*
Corresponding author. Mailing address:
Mikrobiologie/Biotechnologie, Eberhard-Karls-Universität
Tübingen, Auf der Morgenstelle 28, D-72076 Tübingen,
Germany. Phone: 49-7071-2976944. Fax: 49-7071-295979. E-mail:
wowo{at}molbio.biol.biologie.uni-tuebingen.de.

Present address: Universität des Saarlandes, Institut
für Angewandte Mikrobiologie, Im Stadtwald, Gebäude 2, D-66041 Saarbrücken,
Germany.
Antimicrobial Agents and Chemotherapy, July 1999, p. 1565-1573, Vol. 43, No. 7
0066-4804/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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