1,160 results match your criteria ppr proteins

A synthetic RNA editing factor edits its target site in chloroplasts and bacteria.

Commun Biol 2021 May 10;4(1):545. Epub 2021 May 10.

Australian Research Council Centre of Excellence in Plant Energy Biology, School of Molecular Sciences, The University of Western Australia, Crawley, WA, Australia.

Members of the pentatricopeptide repeat (PPR) protein family act as specificity factors in C-to-U RNA editing. The expansion of the PPR superfamily in plants provides the sequence variation required for design of consensus-based RNA-binding proteins. We used this approach to design a synthetic RNA editing factor to target one of the sites in the Arabidopsis chloroplast transcriptome recognised by the natural editing factor CHLOROPLAST BIOGENESIS 19 (CLB19). Read More

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ZmPPR26, a DYW-type pentatricopeptide repeat protein, is required for C-to-U RNA editing at atpA-1148 in maize chloroplasts.

J Exp Bot 2021 Apr 30. Epub 2021 Apr 30.

Key Lab of Plant Development and Environment Adaptation Biology, Ministry of Education, School of Life Sciences, Shandong University, Qingdao, China.

Pentatricopeptide repeat (PPR) proteins are involved in the C-to-U RNA editing of organellar transcripts. Maize genome contains over 600 PPR proteins and few have been found to function in the C-to-U RNA editing in chloroplasts. Here, we report the function of ZmPPR26 in the C-to-U RNA editing and chloroplast biogenesis in maize. Read More

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Comparative Transcriptome Analysis Identified Candidate Genes for Late Leaf Spot Resistance and Cause of Defoliation in Groundnut.

Int J Mol Sci 2021 Apr 26;22(9). Epub 2021 Apr 26.

Center of Excellence in Genomics & Systems Biology (CEGSB), International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad 502324, India.

Late leaf spot (LLS) caused by fungus in groundnut is responsible for up to 50% yield loss. To dissect the complex nature of LLS resistance, comparative transcriptome analysis was performed using resistant (GPBD 4), susceptible (TAG 24) and a resistant introgression line (ICGV 13208) and identified a total of 12,164 and 9954 DEGs (differentially expressed genes) respectively in A- and B-subgenomes of tetraploid groundnut. There were 135 and 136 unique pathways triggered in A- and B-subgenomes, respectively, upon infection. Read More

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OsMORF9 is necessary for chloroplast development and seedling survival in rice.

Plant Sci 2021 Jun 7;307:110907. Epub 2021 Apr 7.

State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China. Electronic address:

Chloroplasts are closely associated with the growth and development of higher plants. Accumulating evidence has revealed that the multiple organellar RNA editing factors (MORF) family of proteins influences plastidic and mitochondrial development through post-transcriptional regulation. However, the role of MORFs in regulating the development of chloroplasts in rice is still unclear. Read More

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The PPR-SMR Protein ATP4 Is Required for Editing the Chloroplast rps8 mRNA in Rice and Maize.

Plant Physiol 2020 Dec;184(4):2011-2021

National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China.

Chloroplast gene expression involves the participation of hundreds of pentatricopeptide repeat (PPR) RNA binding proteins, and proteins in the PLS subfamily typically specify sites of RNA editing, whereas those in the P-subfamily typically stabilize RNA, activate translation, or promote intron splicing. Several P-type PPR proteins include a small MutS-related (SMR) domain, but the biochemical contribution of the SMR domain remains enigmatic. Here, we describe a rice (Oryza sativa) mutant, osatp4, lacking the ortholog of ATP4, a PPR-SMR protein in maize (Zea mays). Read More

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December 2020

The pentatricopeptide repeat protein Rmd9 recognizes the dodecameric element in the 3'-UTRs of yeast mitochondrial mRNAs.

Proc Natl Acad Sci U S A 2021 Apr;118(15)

Department of Cell Biology and Neuroscience, Rowan University School of Osteopathic Medicine, Stratford, NJ 08084;

Stabilization of messenger RNA is an important step in posttranscriptional gene regulation. In the nucleus and cytoplasm of eukaryotic cells it is generally achieved by 5' capping and 3' polyadenylation, whereas additional mechanisms exist in bacteria and organelles. The mitochondrial mRNAs in the yeast comprise a dodecamer sequence element that confers RNA stability and 3'-end processing via an unknown mechanism. Read More

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Response Criteria in Advanced Systemic Mastocytosis: Evolution in the Era of KIT Inhibitors.

Int J Mol Sci 2021 Mar 15;22(6). Epub 2021 Mar 15.

Division of Hematology, School of Medicine, Stanford Cancer Institute/Stanford University, 875 Blake Wilbur Drive, Stanford, CA 94305-6555, USA.

Systemic mastocytosis (SM) is a rare clonal hematologic neoplasm, driven, in almost all cases, by the activating D816V mutation that leads to the growth and accumulation of neoplastic mast cells. While patients with advanced forms of SM have a poor prognosis, the introduction of KIT inhibitors (e.g. Read More

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A PPR Protein ACM1 Is Involved in Chloroplast Gene Expression and Early Plastid Development in .

Int J Mol Sci 2021 Mar 3;22(5). Epub 2021 Mar 3.

Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing 100083, China.

Chloroplasts cannot develop normally without the coordinated action of various proteins and signaling connections between the nucleus and the chloroplast genome. Many questions regarding these processes remain unanswered. Here, we report a novel P-type pentatricopeptide repeat (PPR) factor, named Albino Cotyledon Mutant1 (ACM1), which is encoded by a nuclear gene and involved in chloroplast development. Read More

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Identifying Plant Pentatricopeptide Repeat Proteins Using a Variable Selection Method.

Front Plant Sci 2021 1;12:506681. Epub 2021 Mar 1.

College of Information and Computer Engineering, Northeast Forestry University, Harbin, China.

Pentatricopeptide repeat (PPR), which is a triangular pentapeptide repeat domain, plays an important role in plant growth. Features extracted from sequences are applicable to PPR protein identification using certain classification methods. However, which components of a multidimensional feature (namely variables) are more effective for protein discrimination has never been discussed. Read More

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Cotton Fiber Development Requires the Pentatricopeptide Repeat Protein GhIm for Splicing of Mitochondrial nad7 mRNA.

Genetics 2021 Mar;217(1):1-17

State Key Laboratory of Crop Genetics & Germplasm Enhancement, Hybrid Cotton R & D Engineering Research Center, Ministry of Education, Nanjing Agricultural University, Nanjing 210095, China.

Pentatricopeptide repeat (PPR) proteins encoded by nuclear genomes can bind to organellar RNA and are involved in the regulation of RNA metabolism. However, the functions of many PPR proteins remain unknown in plants, especially in polyploidy crops. Here, through a map-based cloning strategy and Clustered regularly interspaced short palindromic repeats/cas9 (CRISPR/cas9) gene editing technology, we cloned and verified an allotetraploid cotton immature fiber (im) mutant gene (GhImA) encoding a PPR protein in chromosome A03, that is associated with the non-fluffy fiber phenotype. Read More

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The Pentatricopeptide Repeat Protein MEF100 Is Required for the Editing of Four Mitochondrial Editing Sites in .

Cells 2021 Feb 22;10(2). Epub 2021 Feb 22.

Australian Research Council Centre of Excellence in Plant Energy Biology, School of Molecular Sciences, The University of Western Australia, Crawley, WA 6009, Australia.

In there are more than 600 C-to-U RNA editing events in the mitochondria and at least 44 in the chloroplasts. Pentatricopeptide repeat (PPR) proteins provide the specificity for these reactions. They recognize RNA sequences in a partially predictable fashion via key amino acids at the fifth and last position in each PPR motif that bind to individual ribonucleotides. Read More

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February 2021

Heat-Responsive miRNAs Participate in the Regulation of Male Fertility Stability in Soybean CMS-Based F under High Temperature Stress.

Int J Mol Sci 2021 Feb 28;22(5). Epub 2021 Feb 28.

Soybean Research Institute, National Center for Soybean Improvement, Key Laboratory of Biology and Genetic Improvement of Soybean (General, Ministry of Agriculture), State Key Laboratory of Crop Genetics and Germplasm Enhancement, Jiangsu Collaborative Innovation Center for Modern Crop Production, College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China.

MicroRNAs (miRNAs), a class of noncoding small RNAs (sRNAs), are widely involved in the response to high temperature (HT) stress at both the seedling and flowering stages. To dissect the roles of miRNAs in regulating male fertility in soybean cytoplasmic male sterility (CMS)-based F under HT, sRNA sequencing was performed using flower buds from HT-tolerant and HT-sensitive CMS-based F combinations (NF and YF, respectively). A total of 554 known miRNAs, 59 new members of known miRNAs, 712 novel miRNAs, and 1145 target genes of 580 differentially expressed miRNAs (DEMs) were identified under normal temperature and HT conditions. Read More

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February 2021

Conserved co-functional network between maize and Arabidopsis aid in the identification of seed defective genes in maize.

Genes Genomics 2021 May 2;43(5):433-446. Epub 2021 Mar 2.

Guangdong Sugarcane Genetic Improvement Engineering Center, Institute of Bioengineering, Guangdong Academy of Sciences, Guangzhou, 510316, China.

Background: The biological pathways related to Arabidopsis seed development have been well studied and functional genes involved in it have been discovered. However, functional studies about maize seed development were more limited compared to Arabidopsis.

Objective: Therefore, transferring knowledge from Arabidopsis into maize would facilitate functional studies about maize seed development. Read More

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[Heterologous expression and function evaluation of Gloeobacter violaceus rhodopsin in Escherichia coli].

Sheng Wu Gong Cheng Xue Bao 2021 Feb;37(2):604-614

Key Laboratory of Microbial Physiological and Metabolic Engineering, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China.

Proton-pumping rhodopsin (PPR) is a simple photosystem widely distributed in nature. By binding to retinal, PPR can transfer protons from the cytoplasmic to the extracellular side of the membrane under illumination, creating a proton motive force (PMF) to synthesize ATP. The conversion of light into chemical energy by introducing rhodopsin into nonphotosynthetic engineered strains could contribute to promoting growth, increasing production and improving cell tolerance of microbial hosts. Read More

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February 2021

Stable Isotope Labeling of Amino Acids in Flies (SILAF) Reveals Differential Phosphorylation of Mitochondrial Proteins Upon Loss of OXPHOS Subunits.

Mol Cell Proteomics 2021 Feb 25;20:100065. Epub 2021 Feb 25.

Max Planck Institute Biology of Ageing - Karolinska Institutet Laboratory, Division of Metabolic Diseases, Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden; Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden; Centre for Inherited Metabolic Diseases, Karolinska University Hospital, Stockholm, Sweden. Electronic address:

Drosophila melanogaster has been a workhorse of genetics and cell biology for more than a century. However, proteomic-based methods have been limited due to the complexity and dynamic range of the fly proteome and the lack of efficient labeling methods. Here, we advanced a chemically defined food source into direct stable-isotope labeling of amino acids in flies (SILAF). Read More

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February 2021

Functioning of PPR Proteins in Organelle RNA Metabolism and Chloroplast Biogenesis.

Front Plant Sci 2021 9;12:627501. Epub 2021 Feb 9.

Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, China.

The pentatricopeptide repeat (PPR) proteins constitute one of the largest nuclear-encoded protein families in higher plants, with over 400 members in most sequenced plant species. The molecular functions of these proteins and their physiological roles during plant growth and development have been widely studied. Generally, there is mounting evidence that PPR proteins are involved in the post-transcriptional regulation of chloroplast and/or mitochondrial genes, including RNA maturation, editing, intron splicing, transcripts' stabilization, and translation initiation. Read More

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February 2021

The Gene Encodes a Pentatricopeptide Repeat Protein That Is Essential for Asexual Development, Sporulation, and Pathogenesis in .

Front Genet 2020 15;11:535622. Epub 2021 Jan 15.

Henan Agricultural University/Collaborative Innovation Center of Henan Grain Crops/National Key Laboratory of Wheat and Maize Crop Science, Zhengzhou, China.

crown rot (FCR) and head blight (FHB) are caused by and are newly emerging diseases of wheat in China. In this study, we characterized , a gene that encodes a protein with 12 pentatricopeptide repeat (PPR) motifs. The radial growth rate of the Δ deletion mutant was significantly slower than the wild type strain WZ-8A on potato dextrose agar plates and exhibited significantly smaller colonies with sector mutations. Read More

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January 2021

Integration of Transcriptional and Post-transcriptional Analysis Revealed the Early Response Mechanism of Sugarcane to Cold Stress.

Front Genet 2020 25;11:581993. Epub 2021 Jan 25.

Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Guangxi Key Laboratory of Sugarcane Genetic Improvement, Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences, Ministry of Agriculture, Nanning, China.

Cold stress causes major losses to sugarcane production, yet the precise molecular mechanisms that cause losses due to cold stress are not well-understood. To survey miRNAs and genes involved in cold tolerance, RNA-seq, miRNA-seq, and integration analyses were performed on . Results showed that a total of 118,015 genes and 6,034 of these differentially expressed genes (DEGs) were screened. Read More

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January 2021

The pentatricopeptide repeat protein PGR3 is required for the translation of petL and ndhG by binding their 5'UTRs.

Plant Cell Physiol 2021 Jan 13. Epub 2021 Jan 13.

Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan.

PGR3 is a P-class pentatricopeptide repeat (PPR) protein required for the stabilization of petL operon RNA and the translation of the petL gene in plastids. Irrespective of its important roles in plastids, key questions have remained unanswered, including how PGR3 protein promotes translation and which plastid mRNAs PGR3 activates the translation. Here, we show that PGR3 facilitates the translation from ndhG, in addition to petL, through binding to their 5' untranslated regions (UTRs). Read More

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January 2021

The Arabidopsis NOT4A E3 ligase promotes PGR3 expression and regulates chloroplast translation.

Nat Commun 2021 01 11;12(1):251. Epub 2021 Jan 11.

School of Biosciences, University of Birmingham, Edgbaston, B15 2TT, UK.

Chloroplast function requires the coordinated action of nuclear- and chloroplast-derived proteins, including several hundred nuclear-encoded pentatricopeptide repeat (PPR) proteins that regulate plastid mRNA metabolism. Despite their large number and importance, regulatory mechanisms controlling PPR expression are poorly understood. Here we show that the Arabidopsis NOT4A ubiquitin-ligase positively regulates the expression of PROTON GRADIENT REGULATION 3 (PGR3), a PPR protein required for translating several thylakoid-localised photosynthetic components and ribosome subunits within chloroplasts. Read More

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January 2021

Silencing of rice PPR gene PPS1 exhibited enhanced sensibility to abiotic stress and remarkable accumulation of ROS.

J Plant Physiol 2021 Mar-Apr;258-259:153361. Epub 2021 Jan 4.

Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, Sichuan, China. Electronic address:

Abiotic stresses widely constrain the development and reproduction of plant, especially impaired the yield of crops greatly. Recent researches presented pentatricopeptide repeat (PPR) proteins play crucial role in response to abiotic stress. However, the underlying mechanism of PPR genes in regulation of abiotic stress is still obscures. Read More

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January 2021

and Are Required for the Splicing of Mitochondrial Introns, Complex I Assembly, and Seed Development in Maize.

Front Plant Sci 2020 23;11:608550. Epub 2020 Dec 23.

Key Laboratory of Plant Development and Environmental Adaptation Biology, Ministry of Education, School of Life Sciences, Shandong University, Qingdao, China.

RNA splicing is an essential post-transcriptional regulation in plant mitochondria and chloroplasts. As the mechanism of RNA splicing remains obscure, identification and functional elucidation of new splicing factors are necessary. Through a characterization of two maize mutants, we cloned () and (). Read More

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December 2020

OsPPR939, a nad5 splicing factor, is essential for plant growth and pollen development in rice.

Theor Appl Genet 2021 Mar 2;134(3):923-940. Epub 2021 Jan 2.

Institute of Crop Science, Zhejiang University, Hangzhou, 310058, China.

Key Message: P-subfamily PPR protein OsPPR939, which can be phosphorylated by OsS6K1, regulates plant growth and pollen development by involving in the splicing of mitochondrial nad5 introns 1, 2, and 3. In land plants, pentatricopeptide repeat (PPR) proteins play key roles in mitochondrial group II intron splicing, but how these nucleus-encoded proteins are imported into mitochondria is unknown. To date, a few PPR proteins have been characterized in rice (Oryza sativa). Read More

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Efficient Incorporation of Clickable Unnatural Amino Acids Enables Rapid and Biocompatible Labeling of Proteins in Vitro and in Bacteria.

Chembiochem 2021 Apr 4;22(8):1379-1384. Epub 2021 Feb 4.

Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva, 8410501, Israel.

Site-specific incorporation of unnatural amino acids (uAAs) bearing a bioorthogonal group has enabled the attachment - typically at a single site or at a few sites per protein - of chemical groups at precise locations for protein and biomaterial labeling, conjugation, and functionalization. Herein, we report the evolution of chromosomal Methanocaldococcus jannaschii tyrosyl-tRNA synthetase (aaRS) for the alkyne-bearing uAA, 4-propargyloxy-l-phenylalanine (pPR), with ∼30-fold increased production of green fluorescent protein containing three instances of pPR compared with a previously described M. jannaschii-derived aaRS for pPR, when expressed from a single chromosomal copy. Read More

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Mitochondrial RNA quality control in trypanosomes.

Wiley Interdiscip Rev RNA 2021 May 16;12(3):e1638. Epub 2020 Dec 16.

Department of Molecular and Cell Biology, Boston University Medical Campus, Boston, Massachusetts, USA.

Unicellular parasites Trypanosoma brucei spp. cause African human and animal trypanosomiasis, a spectrum of diseases that jeopardize public health and afflict the economy in sub-Saharan Africa. These hemoflagellates are distinguished by a single mitochondrion, which contains a kinetoplast nucleoid composed of DNA and histone-like proteins. Read More

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The novel E-subgroup pentatricopeptide repeat protein DEK55 is responsible for RNA editing at multiple sites and for the splicing of nad1 and nad4 in maize.

BMC Plant Biol 2020 Dec 9;20(1):553. Epub 2020 Dec 9.

State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian, Shandong, 271018, PR China.

Background: Pentatricopeptide repeat (PPR) proteins compose a large protein family whose members are involved in both RNA processing in organelles and plant growth. Previous reports have shown that E-subgroup PPR proteins are involved in RNA editing. However, the additional functions and roles of the E-subgroup PPR proteins are unknown. Read More

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December 2020

A new method for functional analysis of plastid EMBRYO-DEFECTIVE PPR genes by efficiently constructing cosuppression lines in Arabidopsis.

Plant Methods 2020 Nov 18;16(1):154. Epub 2020 Nov 18.

Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai, 200234, China.

Background: Pentatricopeptide-repeat proteins (PPRs) characterized by tandem arrays of a degenerate 35-amino-acid repeat (PPR motif) can bind a single strand RNA and regulate organelle gene expression at the post-transcriptional level, including RNA cleavage, splicing, editing and stability etc. PPRs are conserved in all eukaryotes and extremely expanded in higher plants. Many knockout mutants of PPR genes are embryonically lethal. Read More

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November 2020

Rice FLOURY ENDOSPERM 18 encodes a pentatricopeptide repeat protein required for 5' processing of mitochondrial nad5 messenger RNA and endosperm development.

J Integr Plant Biol 2021 May 4;63(5):834-847. Epub 2021 Mar 4.

State Key Laboratory for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing, 210095, China.

Pentatricopeptide repeat (PPR) proteins, composing one of the largest protein families in plants, are involved in RNA binding and regulation of organelle RNA metabolism at the post-transcriptional level. Although several PPR proteins have been implicated in endosperm development in rice (Oryza sativa), the molecular functions of many PPRs remain obscure. Here, we identified a rice endosperm mutant named floury endosperm 18 (flo18) with pleiotropic defects in both reproductive and vegetative development. Read More

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Genome-wide identification of the restorer-of-fertility-like (RFL) gene family in Brassica napus and expression analysis in Shaan2A cytoplasmic male sterility.

BMC Genomics 2020 Nov 4;21(1):765. Epub 2020 Nov 4.

Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China.

Background: Cytoplasmic male sterility (CMS) is very important in hybrid breeding. The restorer-of-fertility (Rf) nuclear genes rescue the sterile phenotype. Most of the Rf genes encode pentatricopeptide repeat (PPR) proteins. Read More

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November 2020

Can platelet-rich plasma coating improve polypropylene mesh integration? An immunohistochemical analysis in rabbits.

Int Braz J Urol 2021 Mar-Apr;47(2):287-294

Departamento de Urologia, Universidade Estadual de Campinas - UNICAMP, Campinas, SP, Brasil.

Purpose: Despite high success rates in the treatment of urinary incontinence, complications related to the use of polypropylene (PP) meshes are still a concern, especially in vaginal prolapses surgeries. The objective of this study was to assess the effect of autologous platelet-rich plasma (PRP) coating on the integration of PP meshes implanted in the vaginal submucosa of rabbits.

Materials And Methods: Thirty adult New Zealand rabbits were randomly divided into two groups (n=15): PP, implanted with conventional PP meshes; and PRP, implanted with autologous PRP coated PP meshes. Read More

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