EC 220.127.116.11 Enzyme
diphosphate:microsomal-membrane-protein O-phosphotransferase (erroneous);
pyrophosphate:protein phosphotransferase (erroneous);
diphosphate---protein phosphotransferase (erroneous);
diphosphate:[microsomal-membrane-protein] O-phosphotransferase (erroneous)
Transferring phosphorus-containing groups;
Other protein kinases
triphosphate + [microsomal-membrane protein] = diphosphate + phospho-[microsomal-membrane protein] [RN:
microsomal-membrane protein [CPD:
This enzyme was originally thought to use diphosphate as substrate  but this has since been disproved . The activity is observed as the second part of a biphasic reaction after depletion of ATP. Tripolyphosphate is a contaminant of [gamma-32P]ATP.
EC 18.104.22.168 created 1983 as EC 22.214.171.124, transferred 2005 to EC 126.96.36.199
Lam KS, Kasper CB.
Pyrophosphate:protein phosphotransferase: a membrane-bound enzyme of endoplasmic reticulum.
Proc Natl Acad Sci U S A 77:1927-31 (1980)
Tripolyphosphate is an alternative phosphodonor of the selective protein phosphorylation of liver microsomal membrane.
J Biol Chem 261:2645-53 (1986)
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