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Calmodulin-stimulat...
Calmodulin-stimulated Ca2+-ATPases in the vacuolar and plasma membranes in cauliflower
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- Askerlund, Per (author)
- Jönköping University,HLK, Ämnesforskning,Department of Plant Biochemistry, Lund University, Lund, Sweden
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(creator_code:org_t)
- 1997
- 1997
- English.
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In: Plant Physiology. - 0032-0889 .- 1532-2548. ; 114:3, s. 999-1007
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Abstract
Subject headings
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- The subcellular locations of Ca2+-ATPases in the membranes of cauliflower (Brassica oleracea L.) inflorescences were investigated. After continuous sucrose gradient centrifugation a 111-kD calmodulin (CaM)-stimulated and CaM-binding Ca2+-ATPase (BCA1; P. Askerlund [1996] Plant Physiol 110: 913–922; S. Malmstrom, P. Askerlund, M.G. Palmgren [1997] FEBS Lett 400: 324–328) comigrated with vacuolar membrane markers, whereas a 116-kD CaM-binding Ca2+-ATPase co-migrated with a marker for the plasma membrane. The 116-kD Ca2+-ATPase was enriched in plasma membranes obtained by aqueous two-phase partitioning, which is in agreement with a plasma membrane location of this Ca2+-ATPase. Countercurrent distribution of a low-density intracellular membrane fraction in an aqueous two-phase system resulted in the separation of the endoplasmic reticulum and vacuolar membranes. The 111-kD Ca2+-ATPase co-migrated with a vacuolar membrane marker after countercurrent distribution but not with markers for the endoplasmic reticulum. A vacuolar membrane location of the 111-kD Ca2+-ATPase was further supported by experiments with isolated vacuoles from cauliflower: (a) Immunoblotting with an antibody against the 111-kD Ca2+-ATPase showed that it was associated with the vacuoles, and (b) ATP-dependent Ca2+ uptake by the intact vacuoles was found to be CaM stimulated and partly protonophore insensitive.
Subject headings
- NATURVETENSKAP -- Biologi -- Biokemi och molekylärbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Biochemistry and Molecular Biology (hsv//eng)
Keyword
- Calcium-Transporting ATPases/isolation & purification/*metabolism
- Calmodulin/*pharmacology
- Cell Fractionation
- Cell Membrane/enzymology/ultrastructure
- Centrifugation; Density Gradient
- Egtazic Acid/pharmacology
- Vacuoles/*enzymology/ultrastructure
- Vegetables/*enzymology
Publication and Content Type
- ref (subject category)
- art (subject category)
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