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- W1900798924 abstract "The Burkholderia cepacia complex (Bcc) is a group of Gram-negative bacilli that are ubiquitous in the environment and have emerged over the past 30 years as opportunistic pathogens in immunocompromised populations, specifically individuals with cystic fibrosis (CF) and chronic granulomatous disease. This complex of at least 18 distinct species is phenotypically and genetically diverse. One phenotype observed in a subset of Burkholderia cenocepacia (a prominent Bcc pathogen) isolates is the ability to produce a melanin-like pigment. Melanins have antioxidant properties and have been shown to act as virulence factors allowing pathogens to resist killing by the host immune system. The melanin-like pigment expressed by B. cenocepacia is produced through tyrosine catabolism, specifically through the autoxidation and polymerization of homogentisate. Burkholderia cenocepacia J2315 is a CF clinical isolate that displays a pigmented phenotype when grown under normal laboratory conditions. We examined the amino acid sequences of critical enzymes in the melanin synthesis pathway in pigmented and non-pigmented Bcc isolates, and found that an amino acid substitution of glycine for arginine at amino acid 378 in homogentisate 1,2-dioxygenase correlated with pigment production; we identify this as one mechanism for expression of pigment in Bcc isolates." @default.
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- W1900798924 date "2014-12-17" @default.
- W1900798924 modified "2023-10-12" @default.
- W1900798924 title "Single amino acid substitution in homogentisate 1,2-dioxygenase is responsible for pigmentation in a subset of<i>B</i><i>urkholderia cepacia</i>complex isolates" @default.
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- W1900798924 doi "https://doi.org/10.1111/1758-2229.12217" @default.
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