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PMID:18823312

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Citation

Gao, W, Xiao, S, Li, HY, Tsao, SW and Chye, ML (2009) Arabidopsis thaliana acyl-CoA-binding protein ACBP2 interacts with heavy-metal-binding farnesylated protein AtFP6. New Phytol. 181:89-102

Abstract

Arabidopsis thaliana acyl-CoA-binding protein 2 (ACBP2) was observed to interact with farnesylated protein 6 (AtFP6), which has a metal-binding motif (M/LXCXXC). Their interaction and expression in response to heavy metals were investigated. Yeast two-hybrid analysis and in vitro assays showed that an ACBP2 derivative lacking ankyrin repeats did not interact with AtFP6, indicating that the ankyrin repeats mediate protein-protein interaction. Autofluorescence-tagged ACBP2 and AtFP6 transiently co-expressed in tobacco (Nicotiana tabacum) were both targeted to the plasma membrane. Reverse transcriptase polymerase chain reaction and northern blot analyses revealed that AtFP6 mRNA was induced by cadmium (Cd(II)) in A. thaliana roots. Assays using metal-chelate affinity chromatography demonstrated that in vitro translated ACBP2 and AtFP6 bound lead (Pb(II)), Cd(II) and copper (Cu(II)). Consistently, assays using fluorescence analysis confirmed that (His)(6)-AtFP6 bound Pb(II), like (His)(6)-ACBP2. Arabidopsis thaliana plants overexpressing ACBP2 or AtFP6 were more tolerant to Cd(II) than wild-type plants. Plasma membrane-localized ACBP2 and AtFP6 probably mediate Pb(II), Cd(II) and Cu(II) transport in A. thaliana roots. Also, (His)(6)-ACBP2 binds [(14)C]linoleoyl-CoA and [(14)C]linolenoyl-CoA, the precursors for phospholipid repair following lipid peroxidation under heavy metal stress at the plasma membrane. ACBP2-overexpressing plants were more tolerant to hydrogen peroxide than wild-type plants, further supporting a role for ACBP2 in post-stress membrane repair.

Links

PubMed Online version:10.1111/j.1469-8137.2008.02631.x

Keywords

Ankyrin Repeat/physiology; Arabidopsis/metabolism; Arabidopsis Proteins/metabolism; Carrier Proteins/metabolism; Cell Membrane/metabolism; Hydrogen Peroxide; Lipid Peroxidation; Metals, Heavy/metabolism; Protein Prenylation; RNA, Messenger/biosynthesis; Two-Hybrid System Techniques

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

ARATH:ACBP2

enables

GO:0005515: protein binding

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:Q9SZN7

F

Seeded From UniProt

complete

ARATH:ACBP2

enables

GO:0005515: protein binding

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:Q9SZN7

F

Seeded From UniProt

complete

ARATH:HIP26

enables

GO:0005507: copper ion binding

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ARATH:HIP26

enables

GO:0005515: protein binding

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:Q9STP8

F

Seeded From UniProt

complete

ARATH:HIP26

enables

GO:0032791: lead ion binding

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ARATH:HIP26

enables

GO:0046870: cadmium ion binding

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ARATH:HIP26

enables

GO:0005515: protein binding

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:Q9STP8

F

Seeded From UniProt

complete


See also

References

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