Cloning and expression of human 75-kDa inositol polyphosphate- 5-phosphatase

Theodora S. Ross, Anne Bennett Jefferson, Christina A. Mitchell, Philip W. Majerus

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Inositol polyphosphate-5-phosphatase (5-phosphatase) hydrolyzes inositol 1,4,5-trisphosphate and inositol 1,3,4,5-tetrakisphosphate and thereby functions as a signal terminating enzyme in cellular calcium ion mobilization. A cDNA encoding human platelet 5-phosphatase has been isolated by screening for β-galactosidase fusion proteins that bind to inositol 1,3,4,5-tetrakisphosphate. The sensitivity of the screening procedure was enhanced 50- to 100-fold by amplification of "sublibraries" prior to carrying out binding assays. The sequences derived from the "expression clone" were used to screen human erythroleukemia cell line and human megakaryocytic cell line cDNA libraries. We obtained two additional clones which together consist of 2381 base pairs. The ammo-terminal amino acid sequence from the 75-kDa 5-phosphatase purified from platelets is identical to amino acids 38-56 predicted from the cDNA. This suggests that the platelet 5-phosphatase is formed by proteolytic processing of a larger precursor. The cDNA predicts that the mature enzyme contains 635 amino acids (Mr 72, 891). Antibodies directed against recombinant TrpE fusion proteins of either an ammo-terminal region or a carboxyl-terminal region immunoprecipitate the enzyme activity from a preparation of the 75-kDa form of platelet 5-phosphatase (Type II) but do not precipitate the distinct 47-kDa 5-phosphatase (Type I) also found in platelets. In addition, the recombinant protein expressed in Cos-7 cells has the same 5-phosphatase activity as the platelet 5-phosphatase.

Original languageEnglish (US)
Pages (from-to)20283-20289
Number of pages7
JournalJournal of Biological Chemistry
Volume266
Issue number30
StatePublished - 1991

Fingerprint

Polyphosphates
Cloning
Inositol
Phosphoric Monoester Hydrolases
Organism Cloning
Platelets
Blood Platelets
Complementary DNA
Amino Acids
Enzymes
Clone Cells
Galactosidases
Screening
Recombinant Fusion Proteins
Cells
Cell Line
Leukemia, Erythroblastic, Acute
Inositol 1,4,5-Trisphosphate
Inositol Polyphosphate 5-Phosphatases
Gene Library

ASJC Scopus subject areas

  • Biochemistry

Cite this

Ross, T. S., Jefferson, A. B., Mitchell, C. A., & Majerus, P. W. (1991). Cloning and expression of human 75-kDa inositol polyphosphate- 5-phosphatase. Journal of Biological Chemistry, 266(30), 20283-20289.

Cloning and expression of human 75-kDa inositol polyphosphate- 5-phosphatase. / Ross, Theodora S.; Jefferson, Anne Bennett; Mitchell, Christina A.; Majerus, Philip W.

In: Journal of Biological Chemistry, Vol. 266, No. 30, 1991, p. 20283-20289.

Research output: Contribution to journalArticle

Ross, TS, Jefferson, AB, Mitchell, CA & Majerus, PW 1991, 'Cloning and expression of human 75-kDa inositol polyphosphate- 5-phosphatase', Journal of Biological Chemistry, vol. 266, no. 30, pp. 20283-20289.
Ross, Theodora S. ; Jefferson, Anne Bennett ; Mitchell, Christina A. ; Majerus, Philip W. / Cloning and expression of human 75-kDa inositol polyphosphate- 5-phosphatase. In: Journal of Biological Chemistry. 1991 ; Vol. 266, No. 30. pp. 20283-20289.
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