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PMID:21123745

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Citation

Yu, F, Shi, J, Zhou, J, Gu, J, Chen, Q, Li, J, Cheng, W, Mao, D, Tian, L, Buchanan, BB, Li, L, Chen, L, Li, D and Luan, S (2010) ANK6, a mitochondrial ankyrin repeat protein, is required for male-female gamete recognition in Arabidopsis thaliana. Proc. Natl. Acad. Sci. U.S.A. 107:22332-7

Abstract

Double fertilization in angiosperms involves several successive steps, including guidance and reception of the pollen tube and male-female gamete recognition. Each step entails extensive communication and interaction between two different reproductive cell or tissue types. Extensive research has focused on the pollen tube, namely, its interaction with the stigma and reception by maternal cells. Little is known, however, about the mechanism by which the gametes recognize each other and interact to form a zygote. We report that an ankyrin repeat protein (ANK6) is essential for fertilization, specifically for gamete recognition. ANK6 (At5g61230) was highly expressed in the male and female gametophytes before and during but not after fertilization. Genetic analysis of a T-DNA insertional mutant suggested that loss of function of ANK6 results in embryonic lethality. Moreover, male-female gamete recognition was found to be impaired only when an ank6 male gamete reached an ank6 female gamete, thereby preventing formation of homozygous zygotes. ANK6 was localized to the mitochondria, where it interacted with SIG5, a transcription initiation factor previously found to be essential for fertility. These results show that ANK6 plays a central role in male-female gamete recognition, possibly by regulating mitochondrial gene expression.

Links

PubMed PMC3009778 Online version:10.1073/pnas.1015911107

Keywords

Ankyrin Repeat; Arabidopsis/genetics; Arabidopsis/metabolism; Arabidopsis Proteins/genetics; Arabidopsis Proteins/metabolism; Fertilization/physiology; Gene Expression Regulation, Plant/physiology; Mitochondrial Proteins/genetics; Mitochondrial Proteins/metabolism; Mutagenesis, Insertional; Ovule/genetics; Ovule/metabolism; Pollen Tube/genetics; Pollen Tube/metabolism; Repressor Proteins/genetics; Repressor Proteins/metabolism; Sigma Factor/genetics; Sigma Factor/metabolism

Significance

Annotations

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

ARATH:PIA2

enables

GO:0005515: protein binding

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:Q9ZNX9

F

Seeded From UniProt

complete

ARATH:PIA2

located_in

GO:0005634: nucleus

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

ARATH:PIA2

located_in

GO:0005739: mitochondrion

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

ARATH:PIA2

acts_upstream_of_or_within

GO:0009567: double fertilization forming a zygote and endosperm

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:PIA2

acts_upstream_of_or_within

GO:0009553: embryo sac development

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:PIA2

acts_upstream_of_or_within

GO:0080173: male-female gamete recognition during double fertilization forming a zygote and endosperm

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:SIGE

enables

GO:0005515: protein binding

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:Q9FNP4

F

Seeded From UniProt

complete

ARATH:SIGE

located_in

GO:0005739: mitochondrion

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

ARATH:SIGE

involved_in

GO:0009553: embryo sac development

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete


See also

References

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