Sinapultide

Lucinactant is a new synthetic peptide-containing surfactant for intratracheal use. It contains sinapultide, a novel, hydrophobic, 21-amino acid peptide (leucine and lysine repeating units, KL4 peptide) designed to mimic human surfactant protein-B (SB-P). More specifically, it mimics the C-terminal amphipathic helical domain of this protein. It also consists of phospholipids (dipalmitoylphosphatidylcholine, DPPC and palmitoyloleoyl phosphatidylglycerol, POPG) and a fatty acid (palmitic acid). It is completely devoid of animal-derived components.

Please kindly note that our products and services can only be used to support research purposes (Not for clinical use).

CAT No: 10-101-168

CAS No: 138531-07-4

Synonyms/Alias: Sinapultide;138531-07-4;Kl4 peptide;ATI 01;KL4 (peptide);Sinapultida;Sinapultide [USAN:INN];UNII-040X3AX99T;PEPTIDE KL4;PEPTIDE KL-4;RWJ 45652;ATI-01;DTXSID30160707;040X3AX99T;RWJ-45652;SINAPULTIDE (MART.);SINAPULTIDE [MART.];L-Lysine, L-lysyl-L-leucyl-L-leucyl-L-leucyl-L-leucyl-L-lysyl-L-leucyl-L-leucyl-L-leucyl-L-leucyl-L-lysyl-L-leucyl-L-leucyl-L-leucyl-L-leucyl-L-lysyl-L-leucyl-L-leucyl-L-leucyl-L-leucyl-;L-Lysyl-L-leucyl-L-leucyl-L-leucyl-L-leucyl-L-lysyl-L-leucyl-L-leucyl-L-leucyl-L-leucyl-L-lysyl-L-leucyl-L-leucyl-L-leucyl-L-leucyl-L-lysyl-L-leucyl-L-leucyl-L-leucyl-L-leucyl-L-lysine;Sinapultidum;SINAPULTIDE [MI];SINAPULTIDE [INN];SINAPULTIDE [USAN];SCHEMBL180504;CHEMBL2103901;DTXCID3083198;AT42478;DB11332;DA-67594;NS00124788;

Quick InquiryCustom Peptide Synthesis

Peptide Library Construction and Screening

Powerful screening tools in biological and chemical research

M.F/FormulaC126H238N26O22
M.W/Mr.2469.4
SequenceOne Letter Code:KLLLLKLLLLKLLLLKLLLLK
Three Letter Code:H-Lys-Leu-Leu-Leu-Leu-Lys-Leu-Leu-Leu-Leu-Lys-Leu-Leu-Leu-Leu-Lys-Leu-Leu-Leu-Leu-Lys-OH
Labeling TargetLung epithelial cells
ApplicationIntended for the prevention of respiratory distress syndrome (RDS) in premature infants at high risk for RDS.
ActivityAgonist
Biological ActivitySinapultide is a synthetic peptide used to mimic human lung surfactant protein B, the most important surfactant protein for a proper functioning of the respiratory system.
Areas of InterestRespiratory System & Disease
Source#Synthetic
OrganismHuman
InChIInChI=1S/C126H238N26O22/c1-69(2)53-90(137-106(153)85(132)43-33-38-48-127)114(161)145-98(61-77(17)18)122(169)149-99(62-78(19)20)118(165)141-91(54-70(3)4)110(157)133-86(44-34-39-49-128)107(154)138-95(58-74(11)12)115(162)146-103(66-82(27)28)123(170)150-100(63-79(21)22)119(166)142-92(55-71(5)6)111(158)134-87(45-35-40-50-129)108(155)139-96(59-75(13)14)116(163)147-104(67-83(29)30)124(171)151-101(64-80(23)24)120(167)143-93(56-72(7)8)112(159)135-88(46-36-41-51-130)109(156)140-97(60-76(15)16)117(164)148-105(68-84(31)32)125(172)152-102(65-81(25)26)121(168)144-94(57-73(9)10)113(160)136-89(126(173)174)47-37-42-52-131/h69-105H,33-68,127-132H2,1-32H3,(H,133,157)(H,134,158)(H,135,159)(H,136,160)(H,137,153)(H,138,154)(H,139,155)(H,140,156)(H,141,165)(H,142,166)(H,143,167)(H,144,168)(H,145,161)(H,146,162)(H,147,163)(H,148,164)(H,149,169)(H,150,170)(H,151,171)(H,152,172)(H,173,174)/t85-,86-,87-,88-,89-,90-,91-,92-,93-,94-,95-,96-,97-,98-,99-,100-,101-,102-,103-,104-,105-/m0/s1
InChI KeyQSIRXSYRKZHJHX-TWXHAJHVSA-N
References

KL4, a 21-residue peptide containing repeating KLLLL subunits, represents one of the early synthetic surfactant peptides designed to roughly reflect the overall ratio of cationic to hydrophobic amino acids found in native SP-B (22). Despite an early demonstration of SP-B-like activity and the fact that KL4 is currently under evaluation for FDA approval for clinical use as the peptide component of the synthetic exogenous surfactant Surfaxin (Lucinactant), surprisingly little is known about the specific effects of KL4 on phospholipid interfacial film behavior during compression/expansion and collapse.

KL4 Peptide Induces Reversible Collapse Structures on Multiple Length Scales in Model Lung Surfactant

KL4 ([lysine-(leucine)4]4-lysine) is a synthetic peptide based on SP-B structure and is the major constituent of Surfaxin®, a potential therapeutic agent for respiratory distress syndrome in premature infants. There is, however, no clear understanding about the possible lipid-KL4 interactions behind its function, which is an inevitable knowledge to design improved therapeutic agents. To examine the phase behavior, topography, and lipid specificity of KL4/lipid systems, we aimed to study different surfactant model systems containing KL4, neutral dipalmitoylphosphatidylcholine (DPPC) and/or negatively charged dipalmitoylphosphatidylglycerol (DPPG) in the presence of Ca2+ ions. Surface pressure-area isotherms, fluorescence microscopic images, scanning force microscopy as well as time-of-flight secondary ion mass spectrometry suggest that KL4 is not miscible with DPPC and therefore forms peptide aggregates in DPPC/KL4 mixtures; that KL4 specifically interacts with DPPG via electrostatic interactions and induces percolation of DPPG-rich phases; that existing DPPG-Ca2+ interactions are too strong to be overcome by KL4, the reason why the peptide remains excluded from condensed DPPG domains and passively colocalizes with DPPC in a demixed fluid phase; and that the presence of negatively charged lipid is necessary for the formation of bilayer protrusions. These results indicate that the capability of the peptide to induce the formation of a defined surface-confined reservoir depends on the lipid environment, especially on the presence of anionic lipids.

The Surfactant Peptide KL4 in Lipid Monolayers

Write a review Ask a question
My Review for Sinapultide

Required fields are marked with *

  • Basic Information
×
Ask a Question for Sinapultide

Required fields are marked with *

  • Basic Information
×
Featured Recommendations
Related Screening Libraries:
Related Small Molecules:
Useful Tools

Peptide Calculator

Abbreviation List

Peptide Glossary

If you have any peptide synthesis requirement in mind, please do not hesitate to contact us at info@creative-peptides.com. We will endeavor to provide highly satisfying products and services.

Featured Services
Hot Products
  • Elcatonin Acetate

    Elcatonin acetate inhibits the absorption and autolysis of bones, thus leads to blood calcium descending. In addition, it inhibits the bone salts dissolving and transferring and promotes the excretion of calcium and phosphorus in urine.

    Inquiry
  • Teriparatide Acetate

    Teriparatide(recombinant human parathyroid hormone) /PTH (1-34) (human) corresponds to the N-terminal part of human parathyroid hormone, a peptide consisting of 84 amino acids.

    Inquiry
  • Thymosin β4 Acetate

    Thymosin β4 is a 43 amino acid peptide which is regarded as the main intracellular G-actin sequestering peptide. Extracellular thymosin β4 may contribute to physiological processes such as angiogenesis, wound healing and regulation of inflammation.

    Inquiry
  • Glucagon

    Glucagon (Porcine glucagon) is a peptide hormone, produced by pancreatic α-cells. Glucagon stimulates gluconeogenesis. Glucagon decreases the activity of HNF-4. Glucagon increases HNF4α phosphorylation.

    Inquiry
  • Angiotensin II Acetate

    Angiotensin II is an octapeptide that produced from angiotensin I after the removal of two amino acids at the C-terminal by angiotensin-converting enzyme (ACE). Angiotensin II is mediated by AT1 and AT2 receptors, which are seven transmembrane glycoproteins with 30% sequence similarity.

    Inquiry
  • Argipressin

    Vasopressin, also known as arginine vasopressin (AVP), antidiuretic hormone (ADH), or argipressin, is a neurohypophysial hormone found in most mammals. Its two primary functions are to retain water in the body and to constrict blood vessels.

    Inquiry
  • Terlipressin Acetate

    Terlipressin acetate is a vasopressin analogue with potent vasoactive properties. Terlipressin acetate is a highly selective vasopressin V1 receptor agonist that reduces the splanchnic blood flow and portal pressure and controls acute variceal bleeding. Terlipressin acetate exerts anti-inflammatory and anti-oxidative effects. Terlipressin acetate has the potential for hepatorenal syndrome and norepinephrine-resistant septic shock research.

    Inquiry
  • GLP-1 (7-37) Acetate

    Glucagon-like peptide-1 (GLP-1) is an incretin derived from the transcription product of the proglucagon gene. The major source of GLP-1 in the body is the intestinal L cell that secretes GLP-2 as a gut hormone.

    Inquiry
  • Angiotensin II

    Angiotensin II human (Angiotensin II) is a vasoconstrictor that mainly acts on the AT1 receptor. Angiotensin II human stimulates sympathetic nervous stimulation, increases aldosterone biosynthesis and renal actions. Angiotensin II human induces growth of vascular smooth muscle cells, increases collagen type I and III synthesis in fibroblasts, leading to thickening of the vascular wall and myocardium, and fibrosis. Angiotensin II human also induces apoptosis.

    Inquiry
  • Teduglutide

    Teduglutide is a polypeptide consisting of 33 amino acids. It is glucagon-like peptide-2 (GLP-2) analogue that is used for the treatment of short bowel syndrome.

    Inquiry
Get in touch with us

Copyright © 2025 Creative Peptides. All rights reserved.