If you have been reading about Proline-rich sequence and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2026-03-23. Numbers and descriptions here follow the published literature rather than marketing material.
Early work on this family of molecules examined fractions of human gastric juice, where a larger protein was reported to protect gastrointestinal tissue in animal models. BPC 157 was designed as a shorter, more stable fragment of that protein and then studied on its own. The peptide itself is not a normal dietary component and is not present in the human body in meaningful quantities. Descriptions of its origin therefore refer to the research lineage of a laboratory molecule rather than to an endogenous or nutritional substance.
The sequence contains an unusually high proportion of proline and glycine, which limits regular secondary structure and contributes to solubility in aqueous media. The compound dissolves readily in water and in normal saline. Because it is a peptide, digestive enzymes are expected to break it down if it is swallowed, a consideration that influences the routes of administration used in animal experiments. Detailed conformational data remain limited, and published structural models are largely computational.
BPC 157 is a synthetic peptide built from fifteen amino acids. The letters stand for body protection compound, and the number is a laboratory code rather than a description of any biological feature. Its single-letter sequence is GEPPPGKPADDAGLV, which corresponds to a calculated mass near 1419.5 daltons. The material is produced by solid-phase peptide synthesis and is distributed as a lyophilized powder, not as a purified extract from a natural source.
In its usual supplied form, the peptide is a white to off-white lyophilized powder that dissolves readily in water and in aqueous buffers. Powder keeps far longer than solution, so material is normally shipped and stored dry, then dissolved only when needed. Once in solution, the chain is subject to hydrolysis and the liquid supports microbial growth, and practical guidance generally treats the dissolved form as short-lived. Containers should stay sealed and desiccated, because the powder takes up moisture from air.
Long-term storage of the dry powder is typically described at minus twenty degrees Celsius or colder, while shorter holding periods may use ordinary refrigeration. Repeated warming and cooling cycles are discouraged because they stress the material and can promote aggregation or loss. Light exposure and residual moisture are both treated as avoidable sources of degradation, and working aliquots are often prepared to limit how many times a container is opened. Sealed vials with a desiccant are the usual container.
Quality assessment rests on two separate questions: whether the chain is the intended one, and how much of the sample is that chain. Reverse-phase high-performance liquid chromatography with ultraviolet detection is the standard purity measurement, while mass spectrometry confirms identity through the observed molecular mass. Amino acid analysis and sequence verification provide further checks. A reported purity percentage describes the proportion of the sample represented by the main peak, not the amount of peptide by mass, since counter-ions and water make up part of any lyophilized lot.
| Property | Value | Notes |
|---|---|---|
| Molecular weight | About 1419.5 Da | Calculated from the fifteen-residue sequence |
| Residue count | 15 amino acids | Single-letter sequence GEPPPGKPADDAGLV |
| Compound class | Synthetic peptide | Produced by solid-phase synthesis |
| Synonyms | BPC 157; pentadecapeptide BPC 157 | Naming varies across suppliers and papers |
| Appearance | White to off-white powder | Typical form of the lyophilized material |
The molecule carries 15 residues, a molar mass near 1419.5 g/mol, and the formula C62H98N16O22. Its structure features a proline-rich central region, a pair of adjacent aspartic acid residues, and no cysteine. The absence of cysteine means no disulfide bonds can form, which simplifies refolding and reconstitution. Suppliers usually ship the material as a freeze-dried powder that appears white to off-white. It dissolves readily in water and in saline solutions.
Published storage guidance follows general peptide practice rather than product-specific studies. The dry powder is typically kept at minus 20 degrees Celsius, away from light and moisture. Once reconstituted, solutions are generally refrigerated and used over days to weeks, because the aqueous environment slowly promotes hydrolysis and oxidation. Long-term data on degradation rates or breakdown products are sparse. Stated shelf lives from different producers vary widely, reflecting the absence of a shared reference standard.
BPC-157 is a synthetic peptide built from fifteen amino acid residues. Its sequence comes from a larger protein fragment that researchers isolated from human gastric juice and described as a body protection compound. The fragment contains glycine, glutamic acid, five prolines, lysine, alanine, two aspartic acids, leucine, and valine. The number 157 in the name refers to the position of the stretch within the parent protein. Material used in laboratories is manufactured rather than extracted from stomach fluid.
Most published findings come from rodent experiments using induced injury or surgical models. Human reports remain scarce and are largely observational, which limits how much can be stated with confidence. Questions about absorption, distribution, metabolism, and clearance in people are still open. Dose translation between species is likewise unresolved. Researchers tend to read the animal literature as a starting point rather than a settled account.
BPC-157 is a synthetic peptide composed of fifteen amino acids. Its sequence corresponds to part of a protein found in human gastric juice, which is the origin of the "body protection compound" label. In laboratory work the material is treated as a defined research chemical rather than a finished product. Published research has centered on animal models, and the peptide is not an approved medicine in most countries.
The peptide was first described in the early 1990s by a group studying gastric secretions and tissue repair. Its fifteen-residue chain is usually written as GEPPPGKPADDAGLV in single-letter code. The free peptide has the formula C62H98N16O22 and a theoretical mass near 1419.5 daltons. These identifiers are established chemical facts that can be checked against standard peptide databases. There is no ambiguity about the primary structure.
The main chemical liabilities of this sequence are peptide-bond hydrolysis and possible aspartate-related reactions, since the peptide contains aspartic acid residues but no cysteine, methionine, or tryptophan. Absence of those three residues removes the most common oxidation and disulfide pathways from consideration. Studies of related peptides indicate that aspartate isomerisation and aspartimide formation occur most readily at Asp-Gly and Asp-Ala positions, and open questions remain about how quickly those reactions proceed under ordinary laboratory conditions. Storage guidance typically emphasises cool, dry, dark conditions to slow hydrolysis.
Identity and purity are usually assessed with reversed-phase high-performance liquid chromatography, often paired with mass spectrometry using electrospray or MALDI ionisation. Amino acid analysis and peptide mapping by enzymatic digestion provide additional sequence-level confirmation. Purity is commonly reported as an area percentage from a chromatographic trace, and water content can be measured by Karl Fischer titration. Reported masses may differ by tens of daltons between sources because preparations can contain acetate or trifluoroacetate counterions, and such differences are not by themselves evidence of a different peptide.
== Legal status == The US Drug Enforcement Administration issued a notice of intent to publish a temporary order to schedule isotonitazene in Schedule I of the Controlled Substances Act, which came into effect on 20 August 2020.
==== Hospitalized patients ==== Remdesivir was approved for medical use in the United States in October 2020. The US Food and Drug Administration (FDA) approved remdesivir based on the agency's analysis of data from three randomized, controlled clinical trials that included participants hospitalized with mild-to-severe COVID‑19. The FDA granted approval and reissued the revised EUA to Gilead Sciences Inc. The FDA approved remdesivir based primarily on evidence from three clinical trials (NCT04280705, NCT04292899, and NCT04292730) of 2043 hospitalized participants with COVID‑19. The trials were conducted at 226 sites in 17 countries including the United States. In November 2020, the World Health Organization (WHO) updated its guideline on therapeutics for COVID‑19 to include a conditional recommendation against the use of remdesivir, triggered by results from the WHO Solidarity trial. Meanwhile, the Public Health Agency of Canada's COVID‑19 Clinical Pharmacology Task Group recommended that remdesivir only be administered to hospitalized patients as part of a randomized controlled trial due to limited information on risks and benefits. In January 2022, the Canadian component of the WHO Solidarity Trial reported that in-hospital people with COVID‑19 treated with remdesivir had 17% lower relative risk of death (18.7% versus 22.6% death rates) and 47% reduced relative risk for needing oxygen and mechanical ventilation (8.0% versus 15.0%) compared to people receiving standard-of-care treatments.
Bancroft, EA (October 2007). "Antimicrobial resistance: it's not just for hospitals". JAMA. 298 (15): 1803–1804. doi:10.1001/jama.298.15.1803. PMC 2536104. PMID 17940239. Larson, E (2007). "Community factors in the development of antibiotic resistance". Annual Review of Public Health. 28 (1): 435–447. doi:10.1146/annurev.publhealth.28.021406.144020. PMID 17094768.
Sources: en.wikipedia.org
==== Elimination ==== The clearance of oxycodone is 0.8 L/min. Oxycodone and its metabolites are mainly excreted in urine. Therefore, oxycodone accumulates in patients with kidney impairment. Oxycodone is eliminated in the urine 10% as unchanged oxycodone, 45% ± 21% as N-demethylated metabolites (noroxycodone, noroxymorphone, noroxycodols), 11 ± 6% as O-demethylated metabolites (oxymorphone, oxymorphols), and 8% ± 6% as 6-keto-reduced metabolites (oxycodols).
7 August – Deputy Prime Minister Angela Rayner gives China two weeks to explain why parts of its plans for a new embassy in London are blanked out. Rushanara Ali resigns as homelessness minister following criticism about the way she handled a rent increase on a property she owns. 8 August – Starmer describes Israel's plans to take full military control of Gaza City as "wrong" and says they "will only bring more bloodshed". Foreign Secretary David Lammy meets US Vice President JD Vance for talks at his official residence, Chevening House, where they discuss the UK's plans to recognise a Palestinian state. 9 August – Lammy and Vance host a meeting of security officials near London to discuss the war in Ukraine. 12 August – Chancellor Rachel Reeves travels to Stormont to meet ministers, who urge her to use the next budget to invest in public services. 15 August – Afzal Khan resigns as the UK's trade envoy to Turkey following criticism over a trip to the self-declared Turkish Republic of Northern Cyprus, which is not recognised as a state by the UK government. Reform UK leader Nigel Farage writes to the prime minister requesting that he allow him to appoint Reform UK members to the House of Lords. 18 August – Reform UK councillor Joseph Boam is removed as the deputy leader of Leicestershire County Council, where the party runs a minority administration, after three months in the post. He is also removed from his role in cabinet, with no explanation given for either decisions.
Singapore has a highly developed market economy, based historically on extended entrepôt trade. Along with Hong Kong, South Korea, and Taiwan, Singapore is one of the Four Asian Tigers, and has surpassed its peers in terms of Gross Domestic Product (GDP) per capita. Between 1965 and 1995, growth rates averaged around 6 per cent per annum, transforming the living standards of the population. The Singaporean economy is regarded as free, innovative, dynamic and business-friendly. For several years, Singapore has been one of the few countries with a AAA credit rating from the big three, and the only Asian country to achieve this rating. Singapore attracts a large amount of foreign investment as a result of its location, skilled workforce, low tax rates, advanced infrastructure and zero-tolerance against corruption. It was the world's 4th most competitive economy in 2023, according to the International Institute for Management Development's World Competitiveness Ranking of 64 countries, with the highest GDP (PPP) per capita. Roughly 44 per cent of the Singaporean workforce is made up of non-Singaporeans. Despite market freedom, Singapore's government operations have a significant stake in the economy, contributing 22% of the GDP. The city is a popular location for conferences and events.
Individuals with MASS syndrome do not have progressive aortic enlargement or lens dislocation, while people with Marfan syndrome do. Skin involvement in MASS syndrome is typically limited to stretch marks (striae distensae). Also, the skeletal manifestations of MASS syndrome are generally mild.
Sources: en.wikipedia.org
It is a synthetic peptide. Its design was inspired by a fragment of a protein found in human gastric juice, but the fifteen-amino-acid molecule itself is made in a laboratory and is not a normal component of food or of human tissue in appreciable amounts.
The number is an internal laboratory designation from the research group that first described the fragment. It does not encode a molecular weight, a receptor target, or a measured biological effect, and it carries no meaning outside the naming history of the compound.
It contains fifteen amino acid residues and has a calculated mass of roughly 1419.5 daltons. That places it in the short-peptide range, well below the size of small proteins, which affects how it is synthesized, purified, and analyzed.
The dry powder is the stable form and the dissolved form is comparatively fragile. Freezing a solution slows degradation but does not stop it, and repeated freezing and thawing adds further stress. Many laboratories therefore prepare small single-use portions rather than storing one large volume.