In the realm of biochemical research and synthetic biology, the m13 peptide sequence stands out as a foundational tool for studying protein-protein interactions and structural biology. Often associated with the calmodulin-binding domain of skeletal muscle myosin light chain kinase (skMLCK), this 26-amino acid motif has become a standard reference in laboratory settings.
Defining the M13 Peptide
When researchers discuss the peptide M13, they are frequently referring to a specific synthetic segment derived from the skMLCK protein (residues 577–602). M13mp19.M13bacteriophage vector containing a multiple cloning site (MCS). The MCS is reversed relative to M13mp18.SequenceAuthor: New England Biolabs.Read more This sequence is highly valued for its ability to bind to calmodulin (CaM) with high affinity, making it an essential subject for those analyzing binding kinetics and allosteric switches.
The primary sequence one letter code. KRRWKKNFIAVSAANRFKKISSSGAL represents the standard configuration often cited in structural studies. Alternatively, the amino acid peptide is sometimes truncated or modified, such as in the 19-mer variant (RWKKNFIAVSAANRFKKIS), to refine specific interaction studies.
Contextualizing CaM-M13 Complex the Terminology
It is important to distinguish this synthetic peptide from other biological entities that share the M13 nomenclature:
* Enterobacteria phage M13: A filamentous *E. coli* bacteriophage. This virus is a cornerstone of molecular biology, utilized in M13mp18 sequencing and phage display technologies.
* M13 peptidases: A well-studied family of proteases that includes neprilysin and ECE-1. These are distinct from the synthetic peptide used in biochemical binding assays.
* M13 Vectors: Cloning systems, such as M13mp18 or M13mp19, which are used to sequence inserts cloned into the M13 vectors. These vectors often contain universal sequences that facilitate the reading of genetic information.
Applications in Research
In my personal experience exploring biochemical tools, by C Wang·2000·Cited by 48—Sequence-specific noncovalent helix-helix interactions between transmembrane (TM) segments in proteins are investigated by incorporating selected TMsequencesRead more the utility of the M13 motif lies in its versatility. Whether it is being used to investigate helix-helix interactions or as a probe fo Protein names. Recommended name. Capsid protein G8P. Alternative names. Coat protein B; Gene 8 protein (G8P);M13procoat; Major coat protein; pVIII. Gene names.Read more r calmodulin kinetics, the peptide sequence provides a reliable, reproducible baseline.
For those working with phage display, the M13 system is invaluable. The phage can be used to display small peptides with seque by C Wang·2000·Cited by 48—Sequence-specific noncovalent helix-helix interactions between transmembrane (TM) segments in proteins are investigated by incorporating selected TMsequencesRead more nces of 50 amino acids or less, allowing for the screening of high-diversity libraries. In these systems, specific sequences are fused to the Blue: Coat Protein pIII or the major coat protein (pVIII). When designing these experiments, researchers must enter a distinct sequence that is an important, differentiating feature to ensure successful identification of binding partners.
Structural Insights and Variations
The study of peptide M13 often involves looking at how single amino acid substitutions affect binding. For instance, the Asn5Ala mutant is a common variant used to dissect the energetics of the calmodulin-target interaction. Analyzing these sequences requires precise instrumentation and a deep understanding of protein folding, as by J Hammer·1992·Cited by 318—Oligonucleotides encoding peptides known to bind to HLA-DR1 molecules have been inserted into the gene III of filamentousM13phages.Read more the peptide acts as a structural mimic of the natural MLCK domain.
Summary of Technical Observations
The term M13 is a multifaceted identifier in biological science. While the synthetic peptide derived from skMLCK is a vital reagent for interaction studies, the broader M13 bacteriophage system remains the workhorse for DNA manipulation and protein engineering. By maintaining a clear distinction between the synthetic peptide motif and the viral cloning vectors, researchers can better leverage these tools for their specific experimental goals.
Whether you are performing DNA sequencing or investigating the binding affinity of a specific protein domain, understanding the precise sequence of your reagents is the most critical step in ensuring experimental success.