PMID:22945943

Citation	Sosso, D, Canut, M, Gendrot, G, Dedieu, A, Chambrier, P, Barkan, A, Consonni, G and M Rogowsky, P (2012) PPR8522 encodes a chloroplast-targeted pentatricopeptide repeat protein necessary for maize embryogenesis and vegetative development. J. Exp. Bot. 63:5843-57
Abstract	The pentatricopeptide repeat (PPR) domain is an RNA binding domain allowing members of the PPR superfamily to participate in post-transcriptional processing of organellar RNA. Loss of PPR8522 from maize (Zea mays) confers an embryo-specific (emb) phenotype. The emb8522 mutation was isolated in an active Mutator (Mu) population and co-segregation analysis revealed that it was tightly linked to a MuDR insertion in the first exon of PPR8522. Independent evidence that disruption of PPR8522 caused the emb phenotype was provided by fine mapping to a region of 116kb containing no other gene than PPR8522 and complementation of the emb8522 mutant by a PPR8522 cDNA. The deduced PPR8522 amino acid sequence of 832 amino acids contains 10 PPR repeats and a chloroplast target peptide, the function of which was experimentally demonstrated by transient expression in Nicotiana benthamiana. Whereas mutant endosperm is apparently normal, mutant embryos deviate from normal development as early as 3 days after pollination, are reduced in size, exhibit more or less severe morphological aberrations depending on the genetic background, and generally do not germinate. The emb8522 mutation is the first to associate the loss of a PPR gene with an embryo-lethal phenotype in maize. Analyses of mutant plantlets generated by embryo-rescue experiments indicate that emb8522 also affects vegetative plant growth and chloroplast development. The loss of chloroplast transcription dependent on plastid-encoded RNA polymerase is the likely cause for the lack of an organized thylakoid network and an albino, seedling-lethal phenotype.
Links	PubMed PMC3467297 Online version:10.1093/jxb/ers232
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
MAIZE:I1VZH2		GO:0009507: chloroplast	ECO:0000314:		C		Figure 4 shows that PPR8522 (in frames C and G) colocalize with the autofluorescence of chloroplasts (overlays in frames F and J).	complete CACAO 5460
MAIZE:I1VZH2		GO:0010468: regulation of gene expression	ECO:0000315:		P		Figures 5 and 6 show by microarray and Q-PCR that a mutant of PPR8522, emb8522, has several chloroplast genes differentially expressed.	complete CACAO 5461
MAIZE:I1VZH2		GO:0009793: embryo development ending in seed dormancy	ECO:0000315:		P		Figure 1B shows that a PPR8522 mutant, emb8522, has drastically different embryo size from the wild type.	complete CACAO 5462
MAIZE:I1VZH2	part_of	GO:0009507: chloroplast	ECO:0000314: direct assay evidence used in manual assertion		C		Seeded From UniProt	complete
MAIZE:I1VZH2	involved_in	GO:0010468: regulation of gene expression	ECO:0000315: mutant phenotype evidence used in manual assertion		P		Seeded From UniProt	complete
MAIZE:I1VZH2	involved_in	GO:0009793: embryo development ending in seed dormancy	ECO:0000315: mutant phenotype evidence used in manual assertion		P		Seeded From UniProt	complete

References

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