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Michael Ritzau

University of Göttingen

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Publication

Featured researches published by Michael Ritzau.

The Journal of Antibiotics | 1998

ISOLATION AND STRUCTURE OF PEPTAIBOLIN, A NEW PEPTAIBOL FROM SEPEDONIUM STRAINS

Heike Hülsmann; Stephan Heinze; Michael Ritzau; Brigitte Schlegel; Udo Gräfe

peptaibols in microbial culture extracts3~5). Here we report the isolation and structure elucidation of peptaibolin (1, Fig. 1) as an unusual representative of the peptaibol family of lipophilic antibiotics. 1 was disclosed in two fungal strains, Sepedonium sp. HKI-0117 and Sepedonium ampullosporum HKI-0053 coproducing the neuroleptic peptaibol-type antibiotic ampullosporin5). In contrast to the known peptaibols6), the compound 1 contains only five peptide bonds. However, it displays all of the structural features of the

The Journal of Antibiotics | 1998

Alnumycin a New Naphthoquinone Antibiotic Produced by an Endophytic Streptomyces sp.

Björn Bieber; Jörg Nüske; Michael Ritzau; Udo Gräfe

The Journal of Antibiotics | 1997

Ampullosporin, a New Peptaibol-type Antibiotic from Sepedonium ampullosporum HKI-0053 with Neuroleptic Activity in Mice.

Michael Ritzau; Stephan Heinze; Klausjürgen Dornberger; Albrecht Berg; W. F. Fleck; Brigitte Schlegel; Albert Härtl; Udo Gräfe

The Journal of Antibiotics | 1995

Chrysospermins, New Peptaibol Antibiotics from Apiocrea chrysosperma Ap101

Klausjürgen Dornberger; W. Ihn; Michael Ritzau; Udo Gräfe; Brigitte Schlegel; W. F. Fleck; Jörg W. Metzger

The Journal of Antibiotics | 1995

Helioferins; Novel Antifungal Lipopeptides From Mycogone rosea: Screening, Isolation, Structures and Biological Properties

Udo Gräfe; W. Ihn; Michael Ritzau; W. Schade; C. Stengel; Brigitte Schlegel; W. F. Fleck; W. Künkel; A. Härtl; W. Gutsche

The Journal of Antibiotics | 1995

Aurantimycins, new depsipeptide antibiotics from Streptomyces aurantiacus IMET 43917 production, isolation, structure elucidation, and biological activity

Udo Gräfe; R. Schlegel; Michael Ritzau; W. Ihn; Klausjürgen Dornberger; C. Stengel; W. F. Fleck; W. Gutsche; Albert Härtl; E. F. Paulus

The Journal of Antibiotics | 1997

Nocardicyclins A and B: New Anthracycline Antibiotics Produced by Nocardia pseudobrasiliensis.

Yasushi Tanaka; Udo Gräfe; Katsukiyo Yazawa; Yuzuru Mikami; Michael Ritzau

The Journal of Antibiotics | 1996

Isolation and structure of bergofungin, a new antifungal peptaibol from Emericellopsis donezkii HKI 0059

Albrecht Berg; Michael Ritzau; W. Ihn; Brigitte Schlegel; W. F. Fleck; Stephan Heinze; Udo Gräfe

European Journal of Organic Chemistry | 1993

Secondary Metabolites by Chemical Screening, 25. New Cyclic Polysulfides from Hyperthermophilic Archaea of the Genus Thermococcus

Michael Ritzau; Martin S. Keller; Peter Wessels; Karl O. Stetter; Axel Zeeck

Journal of Natural Products | 1998

New macrodiolide antibiotics, 11-O-monomethyl- and 11, 11'-O-dimethylelaiophylins, from Streptomyces sp. HKI-0113 and HKI-0114.

Michael Ritzau; Stephan Heinze; W. F. Fleck; Hans Martin Dahse; Udo Gräfe

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Udo Gräfe

Chiba University

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Brigitte Schlegel

University of Jena

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Axel Zeeck

University of Göttingen

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Albert Härtl

Leibniz Association

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Hans Zähner

University of Tübingen

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Albrecht Berg

University of Jena

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Hannelore Drautz

University of Tübingen

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Hubert Hoff

University of Tübingen

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Siegrid Philipps

University of Göttingen

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Katsukiyo Yazawa

Chiba University

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