klhl40a Antibody
Description
Definition and Biological Context
KLHL40 (Kelch-like family member 40) is a muscle-specific protein critical for stabilizing sarcomere thin filaments. Antibodies targeting KLHL40 enable researchers to study its expression, localization, and interactions in muscle tissues. These antibodies are primarily used in techniques like Western blot (WB), immunohistochemistry (IHC), and flow cytometry (FC) .
Molecular Function
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Stabilization of Thin Filament Proteins: KLHL40 binds to nebulin (NEB) and leiomodin 3 (LMOD3), preventing their degradation. Unlike other BBK proteins that promote substrate degradation, KLHL40 enhances protein stability by inhibiting proteasomal ubiquitination of LMOD3 and stabilizing NEB through an unknown mechanism .
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Localization: KLHL40 localizes to the sarcomere I band and A band, overlapping with NEB and LMOD3 in skeletal muscle .
Pathological Implications
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Nemaline Myopathy (NM): Mutations in KLHL40 cause severe NM, characterized by muscle weakness and early lethality. Loss of KLHL40 reduces NEB and LMOD3 levels, leading to sarcomere disorganization and impaired muscle contraction .
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Mouse Models: Klhl40 knockout mice exhibit reduced NEB (by ~50%) and near-complete LMOD3 loss, mimicking human NM pathology .
Interaction Partners
| Protein | Role in Muscle | Impact of KLHL40 Deficiency |
|---|---|---|
| NEB | Regulates thin filament length | 50% reduction in mice |
| LMOD3 | Actin filament nucleation | Near-complete loss in mice |
Research Applications
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Mechanistic Studies: Used to investigate KLHL40’s role in stabilizing NEB and LMOD3 in cell lines (e.g., COS7) and muscle tissues .
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Diagnostic Tools: Detect KLHL40 expression levels in NM patient biopsies to correlate protein deficiency with disease severity .
Limitations and Gaps
Product Specs
Constituents: 50% Glycerol, 0.01M PBS, pH 7.4
