Purine nucleoside phosphorylase from human erythrocytes: Physicochemical properties of the crystalline enzyme

Johanna D. Stoeckler, Ram P. Agarwal, Kailash C. Agarwal, Karl Schmid, Robert E. Parks

Research output: Contribution to journalArticle

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Abstract

The major physicochemical properties of human erythrocytic purine nucleoside phosphorylase (PNPase) have been described. The molecular weight, estimated by ultracentrifugation, molecular sieving and sucrose density gradient centrifugation, ranged from 87 000 to 92 000. Other physical constants of erythrocytic PNPase were: sedimentation coefficient (s20,w), 5.4 S obtained by sedimentation analysis and 5.5 S by the sucrose density gradient procedure; Stokes radius, 38 Å; calculated diffusion coefficient (D20,w), 5.7 × 10-7 cm2 s-1; frictional ratio, 1.29; and partial specific volume calculated from amino acid analysis, 0.73 cm3 g-1. The CD spectra of the human erythrocytic and bovine spleen PNPases were almost identical and indicated a very low α-helical content. Polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate indicated that the molecular weight of the PNPase subunit is 30 000 ± 500. These results corroborate earlier reports that the native enzyme is a homologous trimer. Comparative studies with crystalline bovine spleen PNPase confirmed that it is also a trimer but is somewhat smaller than the human erythrocytic enzyme with a molecular weight of about 86 000.

Original languageEnglish
Pages (from-to)278-283
Number of pages6
JournalBiochemistry
Volume17
Issue number2
StatePublished - Dec 1 1978
Externally publishedYes

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Purine-Nucleoside Phosphorylase
Erythrocytes
Crystalline materials
Molecular Weight
Molecular weight
Enzymes
Sedimentation
Sucrose
Spleen
Density Gradient Centrifugation
Centrifugation
Ultracentrifugation
Electrophoresis
Sodium Dodecyl Sulfate
Density (specific gravity)
Polyacrylamide Gel Electrophoresis
Amino Acids

ASJC Scopus subject areas

  • Biochemistry

Cite this

Stoeckler, J. D., Agarwal, R. P., Agarwal, K. C., Schmid, K., & Parks, R. E. (1978). Purine nucleoside phosphorylase from human erythrocytes: Physicochemical properties of the crystalline enzyme. Biochemistry, 17(2), 278-283.

Purine nucleoside phosphorylase from human erythrocytes : Physicochemical properties of the crystalline enzyme. / Stoeckler, Johanna D.; Agarwal, Ram P.; Agarwal, Kailash C.; Schmid, Karl; Parks, Robert E.

In: Biochemistry, Vol. 17, No. 2, 01.12.1978, p. 278-283.

Research output: Contribution to journalArticle

Stoeckler, JD, Agarwal, RP, Agarwal, KC, Schmid, K & Parks, RE 1978, 'Purine nucleoside phosphorylase from human erythrocytes: Physicochemical properties of the crystalline enzyme', Biochemistry, vol. 17, no. 2, pp. 278-283.
Stoeckler JD, Agarwal RP, Agarwal KC, Schmid K, Parks RE. Purine nucleoside phosphorylase from human erythrocytes: Physicochemical properties of the crystalline enzyme. Biochemistry. 1978 Dec 1;17(2):278-283.
Stoeckler, Johanna D. ; Agarwal, Ram P. ; Agarwal, Kailash C. ; Schmid, Karl ; Parks, Robert E. / Purine nucleoside phosphorylase from human erythrocytes : Physicochemical properties of the crystalline enzyme. In: Biochemistry. 1978 ; Vol. 17, No. 2. pp. 278-283.
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