National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35 GM122510
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01 GM114666
米国
引用
ジャーナル: Proc Natl Acad Sci U S A / 年: 2025 タイトル: Actin isoform-specific interactions revealed by VopV actin-binding repeats. 著者: Elena Kudryashova / Mark A B Kreutzberger / Ewa Niedzialkowska / Songyu Dong / Dmitri S Kudryashov / Edward H Egelman / 要旨: Despite an evolutionary separation of over 300 Mya, there are no amino acid substitutions in certain actin isoforms from reptiles to mammals. What divergence that does exist between different actin ...Despite an evolutionary separation of over 300 Mya, there are no amino acid substitutions in certain actin isoforms from reptiles to mammals. What divergence that does exist between different actin isoforms is primarily tissue-specific, rather than species-specific. Sorting of actin isoforms into distinct cellular compartments is believed to be controlled by actin-binding proteins (ABPs), but little is known about how ABPs can differentiate between actin isoforms. We show that the actin-binding repeat (ABR) of the effector VopV binds to cytoplasmic actin in a unique mode with a low nanomolar affinity, over a thousand times stronger than to muscle actin. Actin mutagenesis and cryo-EM reconstructions reveal that isoform-specific residues of previously unassigned function deep in the cleft between the two actin protofilament strands determine this selectivity. These results suggest a mechanism of highly selective, isoform-specific interactions between actin and its partners, and have broad implications for understanding the evolution of actin. Furthermore, our findings have implications in the pathogenesis of , whose invasion of intestinal epithelial cells relies on the interaction of VopV with cytoplasmic F-actin.
想定した対称性 - らせんパラメータ - Δz: 27.52 Å 想定した対称性 - らせんパラメータ - ΔΦ: -167 ° 想定した対称性 - らせんパラメータ - 軸対称性: C1 (非対称) 解像度のタイプ: BY AUTHOR / 解像度: 3.0 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: cryoSPARC (ver. 4.51) 詳細: To better reflect the helical symmetry and reliably build a multi-subunit model the original cryoSPARC volume was input into IHRSR's himpose to generate an extended helical volume. 使用した粒子像数: 140672