Biology subjects

Pleiner, T.

Publications and source records attributed to Pleiner, T..

9 recordsLinked to original sources

bioRxiv2026

Phage terminase recognition by the bacterial immune sensors Avs2 and Upx

Prokaryotes employ diverse defense strategies to detect and halt the progression of phage infection. Multiple defense systems sense phage proteins through direct binding, including antiviral STAND NTPases (Avs), which oligomerize upon target recognition to induce programmed cell death. The widespread Avs2 family was previously shown to detect the large terminase subunit of tailed phages, but the mechanism of terminase sensing was unknown. Here, we determine the structural basis of terminase recognition by Avs2 from Escherichia coli (EcAvs2). A cryo-EM structure at 2.3 [A] resolution reveals that EcAvs2 forms a flat, C4-symmetric tetramer in which each protomer is bound to a single terminase monomer. Terminase recognition is mediated by a large, shape complementary binding pocket in the EcAvs2 sensor domain, including specific contacts with an unexpected ATP molecule at the interface of EcAvs2 and terminase. Furthermore, we demonstrate that the defense protein Upx also recognizes diverse phage terminases, despite lacking sequence and structural homology to Avs. AlphaFold 3 models indicate that Upx binds an unfolded state of the core terminase ATPase domain, mediated by {beta}-augmentation. These findings highlight the distinct modes of terminase recognition across structurally diverse defense proteins.

molecular biology↗

bioRxiv2026

The ER membrane protein complex acts as a chaperone to promote the biogenesis of multi-bundle membrane proteins

Nearly half of the [~]5,000 human membrane proteins need to assemble into stoichiometric complexes as part of their biogenesis at the endoplasmic reticulum (ER) membrane. How ER resident biogenesis factors coordinate membrane insertion, folding and assembly is not well understood. Here, we demonstrate that the ER membrane protein complex (EMC) insertase additionally acts as a chaperone to facilitate the assembly of heterotrimeric voltage-gated calcium channels (Cav). Using function-separating mutations and inhibitory nanobodies we show that nascent Cav channels are degraded prematurely when EMCs chaperone function is selectively perturbed. Blocking EMCs chaperone function strongly impaired Cav-dependent cardiomyocyte contraction. EMC engagement of the pore-forming Cav-subunit occurred co-translationally and required Cavs first transmembrane domain bundle to protrude from the nascent ribosome*Sec61*multipass translocon complex. Our findings establish a chaperone function for the EMC and reveal that biogenesis of multi-bundle membrane proteins requires a highly orchestrated, co-translational interplay between ER biogenesis factors.

cell biology↗

bioRxiv2025

SHORT DISORDERED PEPTIDES ARE SUFFICIENT TO CONVERT PROTEINS INTO MECHANOSENSORS THAT RESPOND TO PHYSIOLOGICAL CELLULAR FORCES

Mechanical forces regulate many biological processes and a handful of mechanosensor domains have been identified in proteins that respond to cellular forces. The Notch signaling pathway, a key regulator of cell communication processes ranging from animal development to cancer, is activated by mechanical forces generated by cell-cell interactions. The mechanosensing element of Notch is thought to be a 300 amino acid extracellular domain called negative regulatory region (NRR). Ligand binding exerts mechanical forces that are believed to partially unfold NRR, rendering it susceptible to cleavage by extracellular metalloproteases that leads to activation of signaling. However, some engineered notch-like receptors lacking the NRR can be activated upon ligand binding, although the mechanisms underlying this activation are not known. Here we observe that Notch molecules without the NRR, but with a 12 amino acid sequence present in the extracellular juxta-transmembrane domain (eJTMD) are also cleaved and activated upon interaction with their ligands in cultured cells and in transgenic animals. Furthermore, the [~]12 aa eJTMD from notch genes from other species (chicken, xenopus, zebrafish and Drosophila), from other unrelated transmembrane proteins (erbB4, N-CAM, and E-Cadherin), or multiple artificial sequences of [~]12 amino acids without any apparent structure or specific sequence can also convert proteins into ligand-dependent mechanosensors. These results indicate that short, disordered amino acid sequences that are commonly found in many proteins are capable of imparting mechanosensing capabilities into proteins, suggesting that mechanical force may regulate many more cellular processes than previously suspected.

cell biology↗

bioRxiv2023

Role of a holo-insertase complex in the biogenesis of biophysically diverse ER membrane proteins

Mammalian membrane proteins perform essential physiologic functions that rely on their accurate insertion and folding at the endoplasmic reticulum (ER). Using forward and arrayed genetic screens, we systematically studied the biogenesis of a panel of membrane proteins, including several G-protein coupled receptors (GPCRs). We observed a central role for the insertase, the ER membrane protein complex (EMC), and developed a dual-guide approach to identify genetic modifiers of the EMC. We found that the back of sec61 (BOS) complex, a component of the multipass translocon, was a physical and genetic interactor of the EMC. Functional and structural analysis of the EMC*BOS holocomplex showed that characteristics of a GPCRs soluble domain determine its biogenesis pathway. In contrast to prevailing models, no single insertase handles all substrates. We instead propose a unifying model for coordination between the EMC, multipass translocon, and Sec61 for biogenesis of diverse membrane proteins in human cells.

cell biology↗

bioRxiv2023

Nucleoporin-binding nanobodies that either track or inhibit nuclear pore complex assembly

Nuclear pore complex (NPC) biogenesis is a still enigmatic example of protein self-assembly. We now introduce several cross-reacting anti-Nup nanobodies for imaging intact NPCs from frog to human. We further report a simplified assay that directly tracks postmitotic NPC assembly by added labeled anti-Nup nanobodies. In interphase, NPCs are inserted into a pre-existing nuclear envelope. This makes it difficult to monitor this process as newly-assembled NPCs must be distinguished from pre-existing ones. We solved this problem by inserting Xenopus NPCs into human nuclear envelopes and using frog-specific anti-Nup nanobodies for detection. We also asked whether anti-nucleoporin (Nup) nanobodies could serve as NPC assembly inhibitors. A first generation, selected from immune libraries against Xenopus Nups, comprised only bright stainers of intact NPCs but no inhibitors, perhaps because the immune response was biased towards non-conserved and, thus, functionally-irrelevant epitopes. To overcome this bias, we selected for crossreactivity between Xenopus and human Nups and obtained anti-Nup93, Nup98, and Nup155 nanobodies that block Nup-Nup interfaces and arrest NPC assembly. We solved structures of nanobody-target complexes and identified roles for the Nup93--solenoid in recruiting Nup358 and the Nup214{middle dot}88{middle dot}62 complex, and for Nup155 and the Nup98 autoproteolytic domain in NPC-scaffold assembly. The latter suggests an assembly checkpoint linking pore formation to permeability barrier assembly.

cell biology↗

bioRxiv2023

A nanobody-based strategy for rapid and scalable purification of native human protein complexes

Native isolation of proteins in high yield and purity is a major bottleneck for analysis of their three- dimensional structure, function, and interactome. Here, we present a streamlined workflow for the rapid production of proteins or protein complexes using lentiviral transduction of human suspension cells, combined with highly-specific nanobody-mediated purification and proteolytic elution. (1) First, generation of a plasmid coding for a protein of interest fused to an N- or C- terminal GFP or ALFA peptide tag is rapidly achieved using the lentiviral plasmid toolkit we have designed. (2) Human suspension cell lines stably expressing the tagged fusion protein can be generated in <5 days using lentiviral transduction. (3) Leveraging the picomolar affinity of the GFP and ALFA nanobodies for their respective tags, proteins expressed even at low levels can be specifically captured from the resulting cell lysate in a variety of conditions, including detergents and mild denaturants. (4) Finally, rapid and specific elution of tagged or untagged proteins under native conditions is achieved within minutes at 4{degrees}C using an engineered SUMO protease. We demonstrate the wide applicability of the method by purifying multiple challenging soluble and membrane protein complexes to high purity from human cells. Our strategy is also directly compatible with many widely used GFP expression plasmids, cell lines and transgenic model organisms; is faster than alternative approaches, requiring [~]8 days from cloning to purification; and results in substantially improved yields and purity.

biochemistry↗

bioRxiv2022

A selectivity filter in the EMC limits protein mislocalization to the ER

Tail anchored proteins (TAs) play essential roles at both the ER and mitochondria, and their accurate localization is critical to proteostasis. Biophysical similarities lead to mistargeting of mitochondrial TAs to the ER, where they are delivered to the ER membrane protein complex (EMC). We showed that the EMC directly contributes to sorting fidelity of mitochondrial TAs and multipass substrates that contain positively charged soluble domains. Leveraging an improved structural model of the human EMC, we used mutagenesis and site-specific crosslinking to map the path of a TA from its cytosolic capture by methionine-rich loops to its membrane insertion through a hydrophilic vestibule. Positively charged residues at the entrance to the vestibule function as a selectivity filter that uses charge-repulsion to reject mitochondrial TAs. Substrate discrimination by the EMC provides a biochemical explanation for one role of charge in TA sorting and protects compartment identity by limiting protein misinsertion.

cell biology↗

bioRxiv2020

Regulated assembly of the ER membrane protein complex

The assembly of nascent proteins into multi-subunit complexes is tightly regulated to maintain cellular homeostasis. The ER membrane protein complex (EMC) is an essential insertase that requires seven membrane-spanning and two soluble subunits for function. Here we show that the kinase With no lysine 1 (WNK1), known for its role in hypertension and neuropathy, is required for assembly of the human EMC. WNK1 uses a conserved amphipathic helix to stabilize the soluble subunit, EMC2, by binding to the EMC2-8 interface. Shielding this hydrophobic surface prevents promiscuous interactions of unassembled EMC2 and precludes binding of ubiquitin ligases, permitting assembly. Using biochemical reconstitution, we show that after EMC2 reaches the membrane, its interaction partners within the EMC displace WNK1, and similarly shield its exposed hydrophobic surfaces. This work describes an unexpected role for WNK1 in protein biogenesis, and defines the general requirements of an assembly factor that will apply across the proteome.

molecular biology↗

bioRxiv2017

A toolbox of anti-mouse and rabbit IgG secondary nanobodies

Polyclonal anti-IgG secondary antibodies are essential tools for many molecular biology techniques and diagnostic tests. Their animal-based production is, however, a major ethical problem. Here, we introduce a sustainable alternative, namely nanobodies against all mouse IgG subclasses and rabbit IgG. They can be produced at large scale in E. coli and could thus make secondary antibody-production in animals obsolete. Their recombinant nature allows fusion with affinity tags or reporter enzymes as well as efficient maleimide chemistry for fluorophore-coupling. We demonstrate their superior performance in Western Blotting, both in peroxidase- and fluorophore-linked form. Their site-specific labeling with multiple fluorophores creates bright imaging reagents for confocal and super-resolution microscopy with much smaller label displacement than traditional secondary antibodies. They also enable simpler and faster immunostaining protocols and even allow multi-target localization with primary IgGs from the same species and of the same class.

biochemistry↗