Journal
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
Volume 79, Issue -, Pages 98-104Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ibiod.2013.01.012
Keywords
Phenanthrene; Stenotrophomonas maltophilia; Dioxygenation; ortho-Cleavage; meta-Cleavage
Funding
- U.S. ONR HEET award [N00014-09-1-0709]
- National Institute on Minority Health and Health Disparities [8 G12 MD007601-26]
- Chinese Scholarship Council
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Stenotrophomonas maltophilia strain C6, capable of utilizing phenanthrene as a sole source of carbon and energy, was isolated from creosote-contaminated sites at Hilo, Hawaii. Twenty-two metabolites of phenanthrene, covering from dihydrodiol to protocatechuic acid, were isolated and characterized. Phenanthrene was degraded via an initial dioxygenation on 1,2-, 3,4-, and 9,10-C, where the 3,4-dioxygenation and subsequent metabolisms were most dominant. The metabolic pathways were further branched by ortho- and meta-cleavage of phenanthrene diols to produce 1-hydroxy-2-naphthoic acid, 2-hydroxy-1-naphthoic acid, and naphthalene-1,2-dicarboxylic acid. These intermediates were then transformed to naphthalene-1,2-diol. 1-Hydroxy-2-naphthoic acid was also degraded via a direct ring cleavage. Naphthalene-1,2-diol underwent primarily ortho-cleavage to produce trans-2-carboxycinnamic acid and then to form phthalic acid, 4,5-dihydroxyphthalic acid and protocatechuic acid. Accumulation of salicylic acid in prolonged incubation indicated that a limited extent of meta-cleavage of naphthalene1,2-diol also occurred. This is the first study of detailed phenanthrene metabolic pathways by Stenotrophomonas maltophilia. (C) 2013 Elsevier Ltd. All rights reserved.
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