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Delta-Tonoplast intrinsic protein defines unique plant vacuole functions.

ABSTRACT: Plant cell vacuoles may have either storage or degradative functions. Vegetative storage proteins (VSPs) are synthesized in response to wounding and to developmental switches that affect carbon and nitrogen sinks. Here we show that VSPs are stored in a unique type of vacuole that is derived from degradative central vacuoles coincident with insertion of a new tonoplast intrinsic protein (TIP), delta-TIP, into their membranes. This finding demonstrates a tight coupling between the presence of delta-TIP and acquisition of a specialized storage function and indicates that TIP isoforms may determine vacuole identity.

SUBMITTER: Jauh GY

PROVIDER: S-EPMC23684 | biostudies-literature | 1998 Oct

REPOSITORIES: biostudies-literature

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delta-Tonoplast intrinsic protein defines unique plant vacuole functions.

Jauh G Y GY Fischer A M AM Grimes H D HD Ryan C A CA Rogers J C JC

Proceedings of the National Academy of Sciences of the United States of America 19981001 22

Plant cell vacuoles may have either storage or degradative functions. Vegetative storage proteins (VSPs) are synthesized in response to wounding and to developmental switches that affect carbon and nitrogen sinks. Here we show that VSPs are stored in a unique type of vacuole that is derived from degradative central vacuoles coincident with insertion of a new tonoplast intrinsic protein (TIP), delta-TIP, into their membranes. This finding demonstrates a tight coupling between the presence of delt ...[more]

PMID: 9789029

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