Vacuolar H(+)-translocating pyrophosphatases: a new category of ion translocase.
Trends Biochem Sci
; 17(9): 348-53, 1992 Sep.
Article
em En
| MEDLINE
| ID: mdl-1329278
ABSTRACT
The membrane surrounding the central vacuole of plant cells contains an H(+)-translocating ATPase (H(+)-ATPase) and an H(+)-translocating inorganic pyrophosphatase (H(+)-PPase). Both enzymes are abundant and ubiquitous in plants but the H(+)-PPase is unusual in its exclusive use of inorganic pyrophosphate (PPi) as an energy source. The lack of sequence identity between the vacuolar H(+)-PPase and any other characterized ion pump implies a different evolutionary origin for this translocase. The existence of the vacuolar H(+)-PPase, in conjunction with increasing recognition of PPi as a key metabolite in plant systems, necessitates reconsideration of ATP as the primary energy source for membrane transport in plant cells.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Vacúolos
/
Bombas de Próton
/
Difosfatos
Idioma:
En
Ano de publicação:
1992
Tipo de documento:
Article