Journal: bioRxiv
Article Title: Differential Assembly of Native ENaC Complexes Across Mouse Epithelial Tissues
doi: 10.64898/2026.01.23.701393
Figure Lengend Snippet: a. Cryo-EM map of human ENaC in complex with two Fabs, 10D4 and 7B1, shown in side and top-down views. In the top-down view, a red box highlights the interaction site between 7B1 and the α subunit. b. Sequence alignment of the experimentally determined 7B1 epitope region in human and mouse ENaCα subunits, revealing high conservation and supporting the potential for cross-reactivity with mouse ENaC. c . Schematic representation of the 7B1-mScarlet Fab construct used to detect the ENaC α subunit. The variable regions of the 7B1 heavy and light chains were expressed as a Fab fragment in HEK293 cells, with mScarlet fused to the C-terminus of the heavy chain. d . FSEC trace monitoring mVenus fluorescence from lung lysates of ENaCγ-VF mice, showing the elution profile of γ-containing ENaC complexes. Dotted lines indicate the elution range for mVenus-tagged complexes (11-16 mL). e . FSEC trace from the same sample following 7B1-mScarlet fluorescence, revealing the elution profile of α-containing ENaC complexes. Dashed lines show that the α-associated signal is restricted to a narrower elution range (11-13 mL), suggesting that α-γ co-assemblies represent a more defined subset of the total γ-containing complexes. f . Overlay of the FSEC traces shown in panels d and e , plotted on the same axes to facilitate direct comparison of elution profiles and peak positions. The inset shows the full normalized traces for each condition. The main panel displays a magnified view of the gray-shaded region indicated in the inset, highlighting the relative alignment of the major peaks.
Article Snippet: Endogenous ENaCγ was detected using a rabbit anti-ENaCγ primary antibody (StressMarq, 1:500) targeting the C-terminus, and Alexa Fluor 647 donkey anti-rabbit secondary antibody.
Techniques: Cryo-EM Sample Prep, Sequencing, Construct, Fluorescence, Comparison