title: Cadmium induced oxalic acid secretion and its role in metal uptake and detoxification mechanisms in Phanerochaete chrysosporium.
abstract: This study examines the role of oxalic acid in the uptake of Cd and participation in detoxification process in Phanerochaete chrysosporium. Cd-induced oxalic acid secretion was observed with growth inhibition and enzyme inactivation (LiP and MnP) of P. chrysosporium. The peak value of oxalic acid concentration was 16.6 mM at initial Cd concentration of 100 mg L(-1). During the short-term uptake experiments, the uptake of Cd was enhanced and accelerated in the presence of oxalic acid and resulted in alleviated growth and enzyme inhibition ratios. The formation of a metal-oxalate complex therefore may provide a detoxification mechanism via effect on metal bioavailability, whereby many fungi can survive and grow in environments containing high concentrations of toxic metals. The present findings will advance the understanding of fungal resistance to metal stress, which could show promise for a more useful application of microbial technology in the treatment of metal-polluted waste.
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, 410082, Hunan, People's Republic of China.
authors.forename: Piao
authors.initials: P
authors.lastname: Xu
authors.forename: Yang
authors.initials: Y
authors.lastname: Leng
authors.forename: Guangming
authors.initials: G
authors.lastname: Zeng
authors.forename: Danlian
authors.initials: D
authors.lastname: Huang
authors.forename: Cui
authors.initials: C
authors.lastname: Lai
authors.forename: Meihua
authors.initials: M
authors.lastname: Zhao
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wei
authors.forename: Ningjie
authors.initials: N
authors.lastname: Li
authors.forename: Chao
authors.initials: C
authors.lastname: Huang
authors.forename: Chen
authors.initials: C
authors.lastname: Zhang
authors.forename: Fangling
authors.initials: F
authors.lastname: Li
authors.forename: Min
authors.initials: M
authors.lastname: Cheng
mesh_terms: D001692:Biological Transport / Q000187:drug effects; D002104:Cadmium / Q000378:metabolism* / Q000633:toxicity; D004791:Enzyme Inhibitors / Q000378:metabolism / Q000633:toxicity; D008658:Inactivation, Metabolic; D050296:Microbial Viability / Q000187:drug effects; D019815:Oxalic Acid / Q000378:metabolism*; D020075:Phanerochaete / Q000187:drug effects* / Q000201:enzymology / Q000254:growth & development / Q000378:metabolism*
chemical_list: D004791:Enzyme Inhibitors; D002104:Cadmium; D019815:Oxalic Acid