Abstract
The biochemical properties of the alkaline phosphatases (AlPs) produced by Rhizopus microsporus are described. High enzymic levels were produced within 1–2 d in agitated cultures with 1 % wheat bran. Intra- and extracellular AlPs were purified 5.0 and 9.3×, respectively, by DEAE-cellulose and ConA-sepharose chromatography. Molar mass of 118 and 120 kDa was estimated by gel filtration for both forms of phosphatases. SDS-PAGE indicated dimeric structures of 57 kDa for both forms. Mn2+, Na+ and Mg2+ stimulated the activity, while Al3+ and Zn2+ activated only the extracellular form. Optimum temperature and pH for both phosphatases were 65 °C and pH 8.0, respectively. The enzymes were stable at 50 °C for at least 15 min. Hydrolysis of 4-nitrophenyl phosphate exhibited a K m 0.28 and 0.22 mmol/L, with υ lim 5.89 and 4.84 U/mg, for intra- and extracellular phosphatases, respectively. The properties of the reported AlPs may be suitable for biotechnological application.
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Abbreviations
- AcP(s):
-
acid phosphatase(s)
- AlP(s):
-
alkaline phosphatase(s)
- ConA:
-
concanavalin A
- 4-NPP:
-
4-nitrophenyl phosphate
- P i :
-
inorganic phosphate
- SbmF:
-
submerged fermentation
- SSF:
-
solid state fermentation
- Tris-HCl:
-
Tris(hydroxymethyl)aminomethane
- UDP-Glc:
-
uridine 5’-diphosphoglucose
- UDP-Glc:
-
uridine 5’-diphosphoglucose
- UDP-GlcNAc:
-
uridine 5’-diphospho-N-acetylglucosamine
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Barbosa, A., GuimarÃes, L.H.S., Terenzi, H.F. et al. Purification and biochemical characterization of thermostable alkaline phosphatases produced by Rhizopus microsporus var. rhizopodiformis . Folia Microbiol 53, 509–516 (2008). https://doi.org/10.1007/s12223-008-0080-4
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DOI: https://doi.org/10.1007/s12223-008-0080-4