title: Role of sea water DIP and DOP in controlling bulk alkaline phosphatase activity in N.W. Mediterranean Sea (Toulon, France).
abstract: The regulation of alkaline phosphatase activity by dissolved inorganic (DIP) and organic phosphorus (DOP) and the contribution of DOP as phosphorus source were studied monthly in Toulon Bay (NW Mediterranean, France) in 2005-2006. The concentrations of DIP and DOP varied respectively from 0 to 0.185μM and from 0 to 0.329μM. The bulk activities (Vm, Km, Vm/Km) were measured using MUFP as substrate. Its high affinity component (Km: 0.05-1.00μM) was negatively correlated with the sum of the concentrations of DIP and DOP but not with these compounds taken independently. A negative correlation with DIP was found when the concentrations of DOP were lower than 0.08μM. A negative correlation with DOP was shown when the concentrations of DIP were lower than 0.05μM. This high affinity component can be considered as a valuable indicator for the potential utilization of the compounds which contribute to the intracellular phosphorus pool.
authors.affiliation: Laboratoire PROTEE-EBMA (EA 3819), Université du SUD TOULON VAR, Avenue de l'Université, BP 20132, F-83957 La Garde, Cedex, France. boge@univ-tln.fr
authors.forename: Gérard
authors.initials: G
authors.lastname: Bogé
authors.forename: Magali
authors.initials: M
authors.lastname: Lespilette
authors.forename: Dominique
authors.initials: D
authors.lastname: Jamet
authors.forename: Jean Louis
authors.initials: JL
authors.lastname: Jamet
mesh_terms: D000469:Alkaline Phosphatase / Q000032:analysis* / Q000737:chemistry; D005602:France; D008522:Mediterranean Sea; D010758:Phosphorus / Q000032:analysis / Q000737:chemistry*; D012623:Seawater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D014874:Water Pollutants, Chemical; D010758:Phosphorus; D000469:Alkaline Phosphatase