Characterization of Bacterium Isolated from the Sediment at Coastal Area of Omura Bay in Japan and Several Biological Activities of Pigment Produced by This Isolate

Microbiology and Immunology - Tập 49 Số 5 - Trang 407-415 - 2005
Takuji Nakashima1,2, Maki Kurachi1, Munehiro Nakata2, Kenichi Yamaguchi1, Tatsuya Oda1
1Division of Biochemistry, Faculty of Fisheries, Nagasaki University, Nagasaki, Nagasaki, 852-8521 Japan
2Nagasaki Prefecture Collaboration of Regional Entities for the Advancement of Technological Excellence, JST, Omura, Nagasaki, 856-0026 Japan

Tóm tắt

Abstract

Recently we discovered a bacterial strain (MS‐02–063) that produces large amounts of red pigment from coastal area of Nagasaki Prefecture, Japan. Comparative 16S rDNA gene sequencing analysis revealed that strain MS‐02–063 was phylogenetically closely related to γ‐proteobacterium Hahella sp. MBIC 3957 that produces prodigiosin. However, some physiological and biochemical differences between strain MS‐02–063 and Hahella sp. MBIC 3957 were observed. The red pigment (RP‐063) produced by this isolate was highly purified from the culture supernatant. It was speculated that RP‐063 might be prodigiosin‐like pigment in physical properties and biological activities such as antibacterial and cytotoxic activity. Antibacterial activity of RP‐063 was examined by an agar dilution method. The results indicated that RP‐063 showed antibacterial activity for specific for pathogenic gram‐positive bacteria such as Staphylococcus aureus. The potency of antibacterial activity against S. aureus was nearly equal to those of tetracycline. Moreover, RP‐063 showed inhibition of the superoxide generation by 12‐O‐tetradecanoylphorbol‐13‐acetate (TPA)‐stimulated mouse macrophage RAW 264.7 cell line. Prodigiosin members have a wide variety of biological properties, including anticancer and antimalarial, etc. Especially, potent immunosuppressive properties have been reported for prodigiosin members with the mechanism of action different from that of the other well known immunosuppressors in atopic dermatitis therapy such as cyclosporin A, FK506 and rapamycin. It is suggested that RP‐063 may be able to arrest the inflammation caused by superantigens secreted from S. aureus, which colonized skin on atopic dermatitis as well as suppression of activated lymphocyte proliferation and superoxide generation from leucocytes.

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