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General Enzymatic Properties of Human Histidine Acid Phosphatase-Phytase

히스티딘 에시드 포스파테이즈(Histidine Acid Phosphatase) 계열 인간 파이테이즈(Phytase)의 일반적 특성규명

  • Cho, Jaie-Soon (Department of Animal Sciences and Environment, College of Animal Bioscience & Technology, Konkuk University)
  • 조재순 (건국대학교 동물생명과학대학 동물생산환경학)
  • Received : 2009.03.11
  • Accepted : 2009.04.20
  • Published : 2009.04.01

Abstract

The glycosylated human MINPP (multiple inositol polyphosphate phosphatase), which was recombinantly over-expressed by using industrial host, Pichia pastoris, showed the phytase activity against phytate ($InsP_6$) and the enzyme activity of the unglycosylated counterpart was decreased to 30%. The optimal phytase activity occurred at pH 7.4. The human MINPP showed high substrate specificity for $InsP_6$ with little activity on other organic phosphate conjugates such as para-nitrophenylphosphate (pNPP), ATP, and ribose-1-phosphate (R-1-P). The phosphatase activity against 2,3-bisphosphoglycerate (2,3-BPG) by human MINPP was increased to 1.2-fold in the presence of stimulator, 1 mM 2-phosphoglycolate (2-PG) but the phytase activity against $InsP_6$ was not affected by addition of 1 mM 2-PG. The phosphatase activity against 2,3-BPG by human MINPP was not increased in the presence of 2 mM $Mg^{2+}$ or 100 mM $Cl^-$.

Keywords

MINPP;Pichia pastoris;Phytase;Phosphatase

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