Leucine Zipper
Leucine Zipper - Related Videos
11:31
Metabolic Labeling of Leucine Rich Repeat Kinases 1 and 2 with Radioactive Phosphate
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Cited by 5 •
2013
Leucine rich repeat kinases 1 and 2 (LRRK1 and LRRK2) are multidomain proteins which encode both GTPase and kinase domains and which are phosphorylated in cells. Here, we present a protocol to label LRRK1 and LRRK2 in cells with 32P orthophosphate, thereby providing a means to measure their overall cellular phophorylation levels.
02:42
Eukaryotic Transcription Activators
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2020
Transcription activators are proteins that promote the transcription of genes from DNA to RNA. In most cases, these proteins contain two separate domains ‒ a domain that binds to DNA and a domain for activating transcription; however, in some cases, a single domain is responsible for both binding and activation of transcription, as seen in the glucocorticoid receptor and MyoD. The binding domains are capable of recognizing and interacting with regulatory sequences on the DNA. These domains are...
08:10
Selective Depletion of Microglia from Cerebellar Granule Cell Cultures Using L-leucine Methyl Ester
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Cited by 10 •
2015
Microglia can influence neurons and other glia in culture by various non-cell autonomous mechanisms. Here, we present a protocol to selectively deplete microglia from primary neuronal cultures. This method has the potential to elucidate the role of microglial-neuronal interactions, with implications for neurodegenerative conditions where neuroinflammation is a hallmark feature.
02:04
Protein-protein Interfaces
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2020
Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
08:54
Monitoring Leucine-Rich Repeat Containing 8 Channel (LRRC8/VRAC) Activity Using Sensitized-Emission Förster Resonance Energy Transfer (SE-FRET)
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2024
Electrophysiology is the gold standard for investigating ion channel activity. However, there are plenty of alternative approaches, including optical methods. Here, we describe a method to monitor the activity of the leucine-rich repeat containing 8 channel (LRRC8)-formed anion channels using an inter-subunit Förster resonance energy transfer (FRET)-based method.
FAQs
Repeated leucines align along one face of each amphipathic α-helix, creating complementary hydrophobic surfaces when the helices approach. Their packing favors a specific helix-to-helix arrangement, much like interlocking teeth. This organization helps maintain the associated structure rather than relying on isolated leucine residues distributed randomly across the protein.
Charged residues positioned near the interacting helices can modify both partner preference and association stability. Their effects complement the hydrophobic packing supplied by recurring leucines, helping distinguish one compatible protein from another. Consequently, leucine zipper interactions can support selective dimer formation instead of promoting indiscriminate association among proteins.
An amphipathic helix presents different chemical faces, including a hydrophobic face that contains the regularly spaced leucines. That arrangement allows the interacting helices to pack together while preserving the structural organization of the protein. The result is a physical basis for selective association that can support the formation of functional protein complexes.
Dimerization can convert individually associated transcription-factor subunits into a functional regulatory complex. Once formed, the complex can participate in DNA binding and influence gene expression. Thus, the zipper connects protein-protein recognition with downstream control of cellular responses, making changes in partner association potentially important for transcriptional regulation.
Analysis should focus on whether leucine residues recur at regular intervals along one face of an amphipathic α-helix. Researchers should also consider nearby charged residues, because they may affect partner choice and stability. Together, these features provide a basis for evaluating whether a protein region could support selective helix association.
They provide a mechanistic link between protein recognition and transcriptional regulation. By promoting selected associations among transcription factors, these motifs can influence which functional complexes form and how those complexes bind DNA. This perspective is useful when studying cellular responses in contexts such as development and signaling, where altered gene expression is important.
A change affecting leucine-zipper-mediated association could alter transcription-factor partner choice or complex stability. Because those interactions can influence DNA binding and gene expression, disrupted association offers a framework for investigating abnormal cellular responses. This makes the motif relevant to disease research centered on altered regulation, without requiring the motif itself to be the disease cause.