Related Experiment Video
Updated: Jul 29, 2026
07:42
Dissection of Hippocampal Dentate Gyrus from Adult Mouse
Published on: November 18, 2009
Terminal regions of mouse nebulin: sequence analysis and complementary localization with N-RAP.
A H Herrera1, B Elzey, D J Law
1Laboratory of Physical Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland 20892-2751, USA.
Cell Motility and the Cytoskeleton
|March 8, 2000
Summary
Mouse nebulin
Area of Science:
- Muscle biology
- Protein structure and function
Background:
- Nebulin is a large nebulin protein found in muscle sarcomeres.
- Understanding nebulin's structure is crucial for muscle function research.
Purpose of the Study:
- To clone, sequence, and analyze the terminal regions of mouse nebulin.
- To compare mouse nebulin with human nebulin sequences.
- To determine the localization of nebulin's N- and C-terminal regions within myofibrils.
Main Methods:
- Cloning and sequencing of mouse nebulin's terminal regions.
- Sequence comparison between mouse and human nebulin.
- Expression of nebulin regions in Escherichia coli for antibody production.
- Immunofluorescent and immunogold labeling of nebulin in isolated myofibrils.
Main Results:
- Mouse and human nebulin terminal regions show high conservation.
- Mouse nebulin exhibits deletions in the C-terminal region compared to human nebulin.
- Nebulin's N-terminus is located in the A-band near thin filament tips, and its C-terminus is near the Z-line.
- Nebulin localization is distinct from N-RAP within sarcomeres.
Conclusions:
- Nebulin's terminal regions are highly conserved between mouse and human.
- Specific regions of nebulin are localized to distinct areas within the sarcomere.
- Nebulin plays a specific role in sarcomere structure and function, complementary to N-RAP.
More Related Videos
Related Concept Videos
02:22Regulated mRNA Transport
In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...
02:28Leaky Scanning
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
01:46Nuclear Localization Signals and Import
Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of 2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...
01:42Nuclear Export
The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
NES are of three types- the canonical 10-residue long leucine-rich signal and other...
NES are of three types- the canonical 10-residue long leucine-rich signal and other...