Title of Document: THEORETICAL AND EXPERIMENTAL EVALUATION OF ACETATE THRESHOLDS AS A MONITORING TOOL FOR IN SITU BIOREMEDIATION Supida Piwkhow, Master of Science, 2007 Directed By: Associate Professor, Eric A. Seagren Civil and Environmental Engineering Department Assistant Professor, Jennifer G. Becker Environmental Science and Technology Department H2 thresholds have been widely used to demo...

A methylotrophic bacterium, denoted strain DM11, was isolated from groundwater and shown to utilize dichloromethane or dibromomethane as the sole carbon and energy source. The new isolate grew at the high rate of 0.22 h-1 compared with 11 previously characterized dichloromethane-utilizing bacteria (micromax, 0.08 h-1). The dichloromethane dehalogenase from strain DM11 (group B enzyme) was purif...

The enzyme 4-chlorobenzoyl-CoA dehalogenase hydrolyzes 4-chlorobenzoyl-CoA (4-CBA-CoA) to 4-hydroxybenzoyl-CoA (4-HBA-CoA). Biochemical and crystallographic studies have identified a critical role for the dehalogenase residue Asp 145 in close proximity to the ligand's 4-hydroxy group in the structure of the product-enzyme complex. In the present study the effects of site selective mutations at ...

3-Alkenyl and heteroaryl chloroalcohols have been obtained in excellent enantiomeric excess (>99%) by enzymatic kinetic resolution using the haloalcohol dehalogenase HheC. Yields were close to the theoretical maximum for all substrates employed. Furthermore, the applicability of this methodology on multigram scale has been established.

The biodegradation of 4-chlorobiphenyl usually proceeds through the intermediate 4-chlorobenzoate. Few bacterial strains can degrade 4-chlorobiphenyl to 4-chlorobenzoate and 4-chlorobenzoate to CO2. This study demonstrates that the 4-chlorobiphenyl-degrading Alcaligenes sp. strain ALP83 can degrade 4-chlorobenzoate to 4-hydroxybenzoate. The dehalogenase activity is correlated with a 10-kb fragm...

Clostridium bifermentans strain DPH-1 reportedly dechlorinates tetrachloroethene (PCE) to cis-1,2-dichloroethene. Cultivation-based approaches resolved the DPH-1 culture into two populations: a nondechlorinating Clostridium sp. and PCE-dechlorinating Desulfitobacterium hafniense strain JH1. Strain JH1 carries pceA, encoding a PCE reductive dehalogenase, and shares other characteristics with Des...

Four strains of Butyrivibrio fibrisolvens, transformed with a gene encoding fluoroacetate dehalogenase, maintained a combined population of 10(6) to 10(7) cells ml-1 in the rumens of test sheep. Five inoculated sheep showed markedly reduced toxicological symptoms after fluoroacetate poisoning when behavioral, physiological, and histological effects were compared with those of five uninoculated ...

A 149-amino acid protein designated Cg10062 is encoded by a gene from Corynebacterium glutamicum. The physiological function of Cg10062 is unknown, and the gene encoding this protein has no obvious genomic context. Sequence analysis links Cg10062 to the cis-3-chloroacrylic acid dehalogenase ( cis-CaaD) family, one of the five known families of the tautomerase superfamily. The characterized taut...