Evolutionary conservation of the active site of soluble inorganic pyrophosphatase.
Trends Biochem Sci
; 17(7): 262-6, 1992 Jul.
Article
em En
| MEDLINE
| ID: mdl-1323891
ABSTRACT
Soluble inorganic pyrophosphatases (PPases) are essential enzymes that are important for controlling the cellular levels of inorganic pyrophosphate (PPi). Although prokaryotic and eukaryotic PPases differ substantially in amino acid sequence, recent evidence now demonstrates clearly that PPases throughout evolution show a remarkable level of conservation of both an extended active site structure, which has the character of a mini-mineral, and a catalytic mechanism. PPases require several (three or four) Mg2+ ions at the active site for activity and many of the 15-17 fully conserved active site residues are directly involved in the binding of metal ions. Each of the eight microscopic rate constants that has been evaluated for the PPases from both Escherichia coli and Saccharomyces cerevisiae is quite similar in magnitude for the two enzymes, supporting the notion of a conserved mechanism.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Pirofosfatases
/
Sítios de Ligação
Limite:
Animals
Idioma:
En
Ano de publicação:
1992
Tipo de documento:
Article