Noriyuki Okujo

Bispolides, Novel 20-Membered Ring Macrodiolide Antibiotics from Microbispora

Noriyuki Okujo, HIRONOBU IINUMA, Annie George, Khor Siew Eim et autres

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Siderophore Production of Vibrio parahaemolyticus Strains from Different Sources

Shigeo Yamamoto, Noriyuki Okujo, Shin‐ichi Miyoshi, Sumió Shinoda et autres

Vibrio parahaemolyticus strains isolated from different sources were assayed for their ability to produce a siderophore, vibrioferrin, under iron-limited growth conditions. The mean value +/- standard error of mean (microM vibrioferrin in spent culture supernatant/optical density at 660 nm) was 832.3 +/- …

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Siderophore-Mediated Utilization of Transferrin- and Lactoferrin-Bound Iron by Acinetobacter baumannii

Shigeo Ymamoto, Noriyuki Okujo, Hiroyuki Kataoka, Shizuo Narimatsu

Acinetobacter baumannii produces the siderophore called acinetobactin (AB) in response to iron starvation. In this study, in vitro growth experiments were conducted to evaluate the ability of AB to sequester iron bound to human transferrin and lactoferrin and mediate bacterial utilization of …

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Erratum: Siderophore production of Vibrio parahaemolyticus strains from different sources (Microbiology and Immunology (1999) 43:9 (909-912))

Shiori Yamamoto, Noriyuki Okujo, Shin‐ichi Miyoshi, Sumió Shinoda et autres

Involvement of Vulnibactin and Exocellular Protease in Utilization of Transferrin‐ and Lactoferrin‐Bound Iron by Vibrio vulnificus

Noriyuki Okujo, Toshihito Akiyama, Shin‐ichi Miyoshi, Sumió Shinoda et autres

In vitro growth experiments were conducted to evaluate the ability of vulnibactin, a siderophore produced by Vibrio vulnificus, to sequester transferrin- or lactoferrin bound iron for growth. Comparative studies with the strain producing vulnibactin and its exocellular protease-deficient mutant revealed the involvement …

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Demonstration of a Ferric Vibrioferrin‐Binding Protein in the Outer Membrane of Vibrio parahaemolyticus

Shigeo Yamamoto, Toshihito Akiyama, Noriyuki Okujo, Shiro Matsuura et autres

Under iron-restricted conditions, Vibrio parahaemolyticus produces a siderophore, vibrioferrin, accompanying expression of two major outer membrane proteins of 78 and 83 kDa. Autoradiographic analysis of nondenaturing polyacrylamide gel electrophoregrams of outer membrane preparations previously incubated with [35Fe]ferric vibrioferrin revealed a single radiolabeled …

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Isolation and structure elucidation of acinetobactin., a novel siderophore from Acinetobacter baumannii

Syunsuke Yamamoto, Noriyuki Okujo, Y Sakakibara

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Siderophore‐Mediated Utilization of Iron Bound to Transferrin by Vibrio parahaemolyticus

Shigeo Yamamoto, Noriyuki Okujo, Shyoko Matsuura, Ikuko Fujiwara et autres

Vibrio parahaemolyticus produces a structurally novel type of siderophore, termed vibrioferrin, in response to iron-limitation. This study was performed to examine whether vibrioferrin can assimilate iron from human iron-binding proteins for growth. Comparison of the growth rates between V. parahaemolyticus AQ 3354 …

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Structure and Iron Transport Activity of Vibrioferrin, a New Siderophore of Vibrio parahaemolyticus1

Shigeo Yamamoto, Noriyuki Okujo, Takashi Yoshida, Shiro Matsuura et autres

The structure of vibrioferrin, a siderophore from Vibrio parahaemolyticus, was elucidated based on a combination of partial hydrolysis and spectroscopic techniques. HPLC of purified vibrioferrin showed two peaks with an area ratio of approximately 2:1. However, upon reinjection of each of those …

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Identification of the siderophores from Vibrio hollisae and Vibrio mimicus as aerobactin

Noriyuki Okujo, Shigeo Yamamoto

Hydroxamate siderophores were purified from low-iron cultures of Vibrio hollisae ATCC 33564 and Vibrio mimicus ATCC 33653. By a combination of 1H and 13C NMR spectroscopy, fast atom bombardment mass spectrometry, and compositional analysis, both of the siderophores were identified as aerobactin, …

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Identification of the siderophores from Vibrio hollisae and Vibrio mimicus as aerobactin

Noriyuki Okujo

Hydroxamate siderophores were purified from low-iron cultures of Vibrio hollisae ATCC 33564 and Vibrio mimicus ATCC 33653. By a combination of 1H and 13C NMR spectroscopy, fast atom bombardment mass spectrometry, and compositional analysis, both of the siderophores were identified as aerobactin, …

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Structure of vulnibactin, a new polyamine-containing siderophore from Vibrio vulnificus

Noriyuki Okujo, Miki Saito, Shigeo Yamamoto, Takashi Yoshida et autres

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