Pyrimidine nucleotidases from human erythrocyte possess phosphotransferase activities specific for pyrimidine nucleotides.
FEBS Lett
; 419(2-3): 263-7, 1997 Dec 15.
Article
em En
| MEDLINE
| ID: mdl-9428647
ABSTRACT
Two cytoplasmic forms of pyrimidine nucleotidase (PN-I and PN-II) have been purified from human erythrocytes to apparent homogeneity and partially characterized. They preferentially hydrolyse pyrimidine 5'-monophosphates and 3'-monophosphates respectively. PN-I and PN-II operate as interconverting activities, capable of transferring the phosphate from the pyrimidine nucleoside monophosphate donor(s) to various nucleoside acceptors, including important drugs like 3'-azido-3'-deoxy-thymidine (AZT), cytosine-beta-D-arabinofuranoside (AraC) and 5-fluoro-2'-deoxy-uridine (5FdUrd), pyrimidine analogues widely used in chemotherapy. Kinetic analysis showed linear behaviour for both PN-I and PN-II. PN-I phosphotransferase activity revealed higher affinity for oxynucleosides with respect to deoxy-nucleosides, whereas the contrary seems to be true for PN-II. These results show for the first time that soluble pyrimidine nucleotidases are endowed with pyrimidine-specific phosphotransferase activity.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fosfotransferases
/
Eritrócitos
/
Nucleotidases
Limite:
Humans
Idioma:
En
Revista:
FEBS Lett
Ano de publicação:
1997
Tipo de documento:
Article
País de afiliação:
Itália