Mutations in PIH proteins MOT48, TWI1 and PF13 define common and unique steps for preassembly of each, different ciliary dynein
Year: 2020
Type: article
Abstract: Ciliary dyneins are preassembled in the cytoplasm before being transported into cilia, and a family of proteins containing the PIH1 domain, PIH proteins, are involved in the assembly process.However, the functional differences and relationships between members of this family of proteins remain largely unknown.Using Chlamydomonas reinhardtii as a model, we isolated and characterized two novel Chlamydomonas PIH preassembly mutants, mot48-2 and twi1-1.A new allele of mot48 (ida10), mot48-2, shows large defects in ciliary dynein assembly in the axoneme and altered motility.A second mutant, twi1-1, shows comparatively smaller defects in motility and dynein assembly.A double mutant mot48-2; twi1-1 displays greater reduction in motility and in dynein assembly compared to each single mutant.Similarly, a double mutant twi1-1; pf13 also shows a significantly greater defect in motility and dynein assembly than either parent mutant.Thus, MOT48 (IDA10), TWI1 and PF13 may define different steps, and have partially overlapping functions, in a pathway required for ciliary dynein preassembly.Together, our data suggest the three PIH proteins function in preassembly steps that are both common and unique for different ciliary dyneins. Author summaryMotile cilia are hair-like organelles that protrude from many eukaryotic cells, and play vital roles in organisms including cell motility, environmental sensing and removal of infectious materials.Motile cilia are driven by gigantic motor protein complexes, called ciliary dyneins, defects in which cause abnormal ciliary motility, ultimately resulting in human diseases collectively called primary ciliary dyskinesia (PCD).Ciliary dyneins are preassembled in the cytoplasm before being transported into cilia, and preassembly requires a family of potential co-chaperones, the PIH proteins.Mutations in the PIH proteins cause defective assembly of ciliary dyneins and can result in PCD.However, despite their importance, the precise functions, and functional relationships, between the PIH proteins are unclear.In this study, using Chlamydomonas reinhardtii, we assessed the
Source: PLoS Genetics
Language: English
Subfield: Genetics
Domain: Life Sciences
Open Access status: gold
Estimated APC paid: $2,500
Awards: Functional Substructure of Flagellar Dynein, Structural basis for the centripetal transport mechanism, Functional Analyses of the Novel Ciliary-Dynein Pre-assembly Complex, G2811871066, Molecular function(s) of MOT48 in the dynein pre-assembly, Structural basis for cytoplasmic dynein regulation, Stractural and functional analyses on novel minor dyneins localized to the proximal regions in cilia and flagella, Functional Substructure of Flagellar Dynein, G9000176223
OpenAlex ID: W3095349384