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Kogan GL, Mikhaleva EA, Olenkina OM, Ryazansky SS, Galzitskaya OV, Abramov YA, Leinsoo TA, Akulenko NV, Lavrov SA, Gvozdev VA. Extended disordered regions of ribosome-associated NAC proteins paralogs belong only to the germline in Drosophila melanogaster. Sci Rep 2022; 12:11191. [PMID: 35778515 PMCID: PMC9249742 DOI: 10.1038/s41598-022-15233-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Accepted: 06/21/2022] [Indexed: 11/20/2022] Open
Abstract
The nascent polypeptide-associated complex (NAC) consisting of α- and β-subunits is an essential ribosome-associated protein conserved in eukaryotes. NAC is a ubiquitously expressed co-translational regulator of nascent protein folding and sorting providing for homeostasis of cellular proteins. Here we report on discovering the germline-specific NACαβ paralogs (gNACs), whose β-subunits, non-distinguishable by ordinary immunodetection, are encoded by five highly homologous gene copies, while the α-subunit is encoded by a single αNAC gene. The gNAC expression is detected in the primordial embryonic and adult gonads via immunostaining. The germline-specific α and β subunits differ from the ubiquitously expressed paralogs by the extended intrinsically disordered regions (IDRs) acquired at the N- and C-termini of the coding regions, predicted to be phosphorylated. The presence of distinct phosphorylated isoforms of gNAC-β subunits is confirmed by comparing of their profiles by 2D-isoeletrofocusing resolution before and after phosphatase treatment of testis ribosomes. We revealed that the predicted S/T sites of phosphorylation in the individual orthologous IDRs of gNAC-β sequences of Drosophila species are positionally conserved despite these disordered regions are drastically different. We propose the IDR-dependent molecular crowding and specific coordination of NAC and other proteostasis regulatory factors at the ribosomes of germinal cells. Our findings imply that there may be a functional crosstalk between the germinal and ubiquitous α- and β-subunits based on assessing their depletion effects on the fly viability and gonad development.
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Affiliation(s)
- Galina L Kogan
- NRC "Kurchatov Institute"-Institute of Molecular Genetics, 123182, Moscow, Russia
| | - Elena A Mikhaleva
- NRC "Kurchatov Institute"-Institute of Molecular Genetics, 123182, Moscow, Russia
| | - Oxana M Olenkina
- NRC "Kurchatov Institute"-Institute of Molecular Genetics, 123182, Moscow, Russia
| | - Sergei S Ryazansky
- NRC "Kurchatov Institute"-Institute of Molecular Genetics, 123182, Moscow, Russia
| | - Oxana V Galzitskaya
- Institute of Protein Research, Russian Academy of Sciences, 142290, Pushchino, Russia.,Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, 142290, Pushchino, Russia
| | - Yuri A Abramov
- NRC "Kurchatov Institute"-Institute of Molecular Genetics, 123182, Moscow, Russia
| | - Toomas A Leinsoo
- NRC "Kurchatov Institute"-Institute of Molecular Genetics, 123182, Moscow, Russia
| | - Natalia V Akulenko
- NRC "Kurchatov Institute"-Institute of Molecular Genetics, 123182, Moscow, Russia
| | - Sergey A Lavrov
- NRC "Kurchatov Institute"-Institute of Molecular Genetics, 123182, Moscow, Russia
| | - Vladimir A Gvozdev
- NRC "Kurchatov Institute"-Institute of Molecular Genetics, 123182, Moscow, Russia.
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Takeda S, Koike R, Nagae T, Fujiwara I, Narita A, Maéda Y, Ota M. Crystal structure of human V-1 in the apo form. Acta Crystallogr F Struct Biol Commun 2021; 77:13-21. [PMID: 33439151 PMCID: PMC7805553 DOI: 10.1107/s2053230x20016829] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 12/31/2020] [Indexed: 11/11/2023] Open
Abstract
V-1, also known as myotrophin, is a 13 kDa ankyrin-repeat protein that binds and inhibits the heterodimeric actin capping protein (CP), which is a key regulator of cytoskeletal actin dynamics. The crystal structure of V-1 in complex with CP revealed that V-1 recognizes CP via residues spanning several ankyrin repeats. Here, the crystal structure of human V-1 is reported in the absence of the specific ligand at 2.3 Å resolution. In the asymmetric unit, the crystal contains two V-1 monomers that exhibit nearly identical structures (Cα r.m.s.d. of 0.47 Å). The overall structures of the two apo V-1 chains are also highly similar to that of CP-bound V-1 (Cα r.m.s.d.s of <0.50 Å), indicating that CP does not induce a large conformational change in V-1. Detailed structural comparisons using the computational program All Atom Motion Tree revealed that CP binding can be accomplished by minor side-chain rearrangements of several residues. These findings are consistent with the known biological role of V-1, in which it globally inhibits CP in the cytoplasm.
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Affiliation(s)
- Shuichi Takeda
- Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Ryotaro Koike
- Graduate School of Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Takayuki Nagae
- Synchrotron Radiation Research Center, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Ikuko Fujiwara
- Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Akihiro Narita
- Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Yuichiro Maéda
- Graduate School of Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Motonori Ota
- Graduate School of Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
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