Abstract：
:This study experimentally demonstrated that polyphosphate accumulating organisms (PAOs) losing the abilities of anaerobically synthesizing polyhydroxyalkanoates and aerobically taking up phosphate under Cu(II) presence was due to the inhibition of enzyme activities of acetyl-CoA synthases (ACS) and polyphosphate kinase (PPK), respectively. ACS activity tests showed the apparent maximum specific activity (Vmax) of ACS decreased with increasing Cu(II) concentration, revealing Cu(II) is a mixed inhibitor for ACS. Inhibition coefficients showed Cu(II) has a higher affinity for free ACS than for ACS-coenzyme A complex. PPK activity tests showed the Vmax substantially decreased with increasing Cu(II) concentration, revealing Cu(II) is also a mixed inhibitor for PPK. Inhibition coefficients showed Cu(II) more easily bound to free PPK than to PPK-Adenosine triphosphate complex. Experimental data also showed the aerobic mechanism of PAOs taking up phosphate was completely interrupted when 3mgL(-1) of Cu(II) was added.
journal_name
Chemospherejournal_title
Chemosphereauthors
Tsai YP,Tzeng HF,Lin JW,Lu MS,Lin JYdoi
10.1016/j.chemosphere.2012.11.080subject
Has Abstractpub_date
2013-04-01 00:00:00pages
602-7issue
5eissn
0045-6535issn
1879-1298pii
S0045-6535(12)01551-2journal_volume
91pub_type
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