Description
Purine nucleoside phosphorylase (also known as PNPase) is an enzyme (EC 2.4.2.1) involved in purine metabolism. PNP metabolizes adenosine into adenine, inosine into hypoxanthine, and guanosine into guanine, in each case creating ribose phosphate. NP encodes the enzyme purine nucleoside phosphorylase that together with adenosine deaminase (ADA) serves a key role in purine catabolism, referred to as the salvage pathway. Mutations in either enzyme result in a severe combined immunodeficiency (SCID). Confusingly, the same abbreviation (PNPase), is also used for another, otherwise unrelated, enzyme, namely Polynucleotide Phosphorylase.
Abbr
PNPase (Bacillus sp.)
Alias
PNPase; PUNPI; PUNPII
Applications
Useful for enzymatic determination of inorganic phosphate
Appearance
Colourless to light brown solution
Product Overview
Purine Nucleoside Phosphorylase produced in microorganism has a molecular mass of 32 kDa.
Enzyme Commission Number
EC 2.4.2.1
Contaminants
NADH oxidase < 0.002%
pH Stability
6.0-10.0 (37°C (Tris-HCI buffer)
Thermal stability
Stable at 65°C and below (pH 8.5, 10 mins)
Pathway
Nicotinate and nicotinamide metabolism; Purine metabolism; Pyrimidine metabolism; Nucleotide metabolism.
Function
purine-nucleoside phosphorylase activity; purine-nucleoside phosphorylase activity; purine-nucleoside phosphorylase activity.
Synonyms
inosine phosphorylase; PNPase; PUNPI; PUNPII; inosine-guanosine phosphorylase; nucleotide phosphatase; purine deoxynucleoside phosphorylase; purine deoxyribonucleoside phosphorylase; purine nucleoside phosphorylase; purine ribonucleoside phosphorylase; purine-nucleoside: phosphate ribosyltransferase; EC 2.4.2.1
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