In the world of biochemical research and synthetic peptide exploration, few structures have garnered as much attention as the 18-mer 4F peptide sequence. As someone who has spent significant time studying the structural nuances of synthetic chains, I find the design of this specific 18-amino acid amphipathic helical peptide to be a masterclass in molecular engineering.
Understanding the 4F Peptide Sequence
When we talk about 4F, we are referring to a precisely engineered molecule. The primary amino acid sequence is formally recognized as Ac-DWFKAFYDKVAEKFKEAF-NH2. This peptide is a prominent example of an apolipoprotein A-I mimetic. The "4F" nomenclature is not arbitrary; it refers to the four phenylalanine residues strategically placed within the 18-mer chain, which significantly contribute to its hydrophobic properties.
From my own experience examining these sequences, the 18A analog served as the foundational design, but the modifications in the 4F variant—specifically the placement of those four phenylalanine residues—drastically alter its interaction with lipid environments.
Structural Insights and Characteristics
The peptide 4F is classified as an 18-mer, meaning it consists of exactly 18 amino acid residues. Its amphipathic nature is the key to its function, allowing it to behave in ways similar to naturally occurring proteins.
Key attributes I have noted during my research include:
* Molecular Weight: Approximately 2310 Da.
* Structure: It forms a highly stable alpha-helix.
* Functionality: It is often studied alongside other mers, such as the 37-mer (4F-proline-4F), to compare how length and proline-induced kinks affect structural integrity.
When comp APOA1 gene: MedlinePlus Genetics aring 4F (18mer) to other peptide analogs, it is fascinating to observe how minor shifts in the amino acid order change the molecule's ability to recruit phospholipids. Whether one is looking at the 18 mer or more complex variants, the peptide sequence remains the defining fact 16 Feb 2026—The method supports multiple applications, including redesigning amino acidsequenceson cyclicpeptidebackbones, generating novel structures Read more or for its chemical behavior.
Observations on Research Applications
In many laboratory settings, researchers utilize the Apolipoprotein A-I Mimetic Peptide L-4F to observe how it interacts with lipid bilayers. My experience confirms that this 18-amino acid amphipathic helical peptide is excepti A class of secreted mammalian peptides with potential to onally stable, which is a testament to the effectiveness o by S Khan·2023·Cited by 5—An18-mer peptidederived from prosaposin (PS18: LSELIINNATEELLIKGL), comprising the hydrophilicsequenceof saposin C23, was synthesized by Eurofins Genomics ( Read more f the N-terminal acetylation and C-terminal amidation (the Ac- and -NH2 markers in the sequence).
It is import by GM Anantharamaiah·2007·Cited by 147—Peptide.4Finteracts with existing HDL to recruit phospholipids and apoA-I into these particles, thus producing apoA-I- containing particles (with no apoA-II) Read more ant to distinguish the active 4F peptide from control sequences. For instance, the scrambled peptide, often called Sc-4F, uses the same amino acids but in a rearranged order. This serves as a vital control in experimental setups to ensure that the observed effects are truly due to the specific 18-mer arrangement, rather than non-specific interactions.
Beyond the 18-mer
While the 18-mer 4F peptide is the primary focus, the broader category of mers—including those like CCL18 or even unrelated 20-mer chains that demonstrate self-assembly of the 20-mer peptide into ordered nanofibres—highlights how diverse the field of synthetic pept by GD Wool·2011·Cited by 50—4F is an 18-aa peptidecontaining 4 phenylalanine residues, which contribute to its hydrophobic properties. 4F can alleviate chronic inflammation in several Read more ide chemistry is.
Whether you are analyzing a short 18-residue chain or a longer peptide, the by GD Wool·2009·Cited by 59—This study compares the following mimetics, either acetylated or biotinylated (b):4F (18mer) and 4F-proline-4F (37mer, Pro). b4F interacts with both mouse HDL Read more sequence is the language of the molecule. The 4F peptide remains a gold standard in its class, and its 18-mer structure continues to be a subject of fascination for those of us who appreciate the intricate relationship between structure and function at the molecular level.
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*Disclaimer: This article is for educational and informational purposes only. It does not provide medical advice, diagnosis, or treatment instructions. All information regarding peptide chemistry is intended for research and analytical use only.*