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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국미생물생명공학회 Journal of Microbiology and Biotechnology Journal of Microbiology and Biotechnology 제27권 제9호
- 발행연도
- 2017.1
- 수록면
- 1,692 - 1,700 (9page)
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Ralstonia solanacearum causes bacterial wilt in a wide variety of host plant species and produces a melanin-like blackish-brown pigment in stationary phase when grown in minimal medium supplemented with tyrosine. To study melanin production regulation in R. solanacearum, five mutants exhibiting overproduction of melanin-like pigments were selected from a transposon (Tn) insertion mutant library of R. solanacearum SL341. Most of the mutants, except one (SL341T), were not complemented by the original gene or overproduced melanins. SL341T showed Tn insertion in a gene containing a conserved domain of eukaryotic transcription factor. The gene was annotated as a hypothetical protein, given its weak similarity to any known proteins. Upon complementation with its original gene, the mutant strains reverted to their wild-type phenotype. SL341T produced 3-folds more melanin at 72 h post-incubation compared with wild-type SL341 when grown in minimal medium supplemented with tyrosine. The chemical analysis of SL341T cultural filtrate revealed the accumulation of a higher amount of homogentisate, a major precursor of pyomelanin, and a lower amount of dihydroxyphenylalanine, an intermediate of eumelanin, compared with SL341. The expression study showed a relatively higher expression of hppD (encoding hydroxyphenylpyruvate dioxygenase) and lower expression of hmgA (encoding homogentisate dioxygenase) and nagL (encoding maleylacetoacetate isomerase) in SL341T than in SL341.
SL341 showed a significantly higher expression of tyrosinase gene compared with SL341T at 48 h post-incubation. These results indicated that R. solanacearum produced both pyomelanin and eumelanin, and the novel hypothetical protein is involved in the negative regulation of melanin production.
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참고문헌 (39)
참고문헌 신청
Riley PA. / 1997 / Melanin / Int. J. Biochem. Cell Biol 29:1235~1239
Nosanchuk JD / 1997 / Cellular charge of Cryptococcus neoformans: contributions from the capsular polysaccharide, melanin, and monoclonal antibody binding / Infect. Immun 65:1836~1841
White LP / 1958 / Melanin: a naturally occurring cation exchange material / Nature 182:1427~1428
Nosanchuk JD / 2003 / The contribution of melanin to microbial pathogenesis / Cell. Microbiol 5:203~223
Hill HZ / 1992 / The function of melanin or six blind people examine an elephant / BioEssays 14:49~56
Nosanchuk JD / 1997 / Cellular charge of Cryptococcus neoformans: contributions from the capsular polysaccharide, melanin, and monoclonal antibody binding / Infect. Immun 65:1836~1841
White LP / 1958 / Melanin: a naturally occurring cation exchange material / Nature 182:1427~1428
Nosanchuk JD / 2003 / The contribution of melanin to microbial pathogenesis / Cell. Microbiol 5:203~223
Hill HZ / 1992 / The function of melanin or six blind people examine an elephant / BioEssays 14:49~56
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