General Information

  • ID:  hor005172
  • Uniprot ID:  P63297
  • Protein name:  Secretin
  • Gene name:  SCT
  • Organism:  Cavia porcellus (Guinea pig)
  • Family:  Glucagon family
  • Source:  animal
  • Expression:  NA
  • Disease:  NA
  • Comments:  NA
  • Taxonomy:  Cavia (genus), Caviidae (family), Hystricomorpha (suborder), Rodentia (order), Glires, Euarchontoglires (superorder), Boreoeutheria, Eutheria, Theria, Mammalia (class), Amniota, Tetrapoda, Dipnotetrapodomorpha, Sarcopterygii (superclass), Euteleostomi, Teleostomi, Gnathostomata, Vertebrata, Craniata (subphylum), Chordata (phylum), Deuterostomia, Bilateria, Eumetazoa, Metazoa (kingdom), Opisthokonta, Eukaryota (superkingdom), cellular organisms
  • GO MF:  GO:0005179 hormone activity; GO:0046659 digestive hormone activity
  • GO BP:  GO:0002024 diet induced thermogenesis; GO:0007165 signal transduction; GO:0009992 intracellular water homeostasis; GO:0021766 hippocampus development; GO:0031667 response to nutrient levels; GO:0032098 regulation of appetite; GO:0048167 regulation of synaptic plasticity; GO:0050996 positive regulation of lipid catabolic process
  • GO CC:  GO:0005576 extracellular region; GO:0005615 extracellular space

Sequence Information

  • Sequence:  HSDGTFTSELSRLRDSARLQRLLQGLV
  • Length:  27
  • Propeptide:  HSDGTFTSELSRLRDSARLQRLLQGLV
  • Signal peptide:  NA
  • Modification:  T27 Valine amide
  • Glycosylation:  NA
  • Mutagenesis:  NA

Activity

  • Function:  Hormone involved in different processes, such as regulation of the pH of the duodenal content, food intake and water homeostasis. Exerts its biological effects by binding to secretin receptor (SCTR), a G-protein coupled receptor expressed in the basolateral domain of several cells. Acts as a key gastrointestinal hormone by regulating the pH of the duodenal content. Secreted by S cells of the duodenum in the crypts of Lieberkuehn and regulates the pH of the duodenum by (1) inhibiting the secretion of gastric acid from the parietal cells of the stomach and (2) stimulating the production of bicarbonate (NaHCO(3)) from the ductal cells of the pancreas (By similarity). Production of bicarbonate is essential to neutralize the pH and ensure no damage is done to the small intestine by the gastric acid. In addition to regulating the pH of the duodenal content, plays a central role in diet induced thermogenesis: acts as a non-sympathetic brown fat (BAT) activator mediating prandial thermogenesis, which consequentially induces satiation. Mechanistically, secretin released by the gut after a meal binds to secretin receptor (SCTR) in brown adipocytes, activating brown fat thermogenesis by stimulating lipolysis, which is sensed in the brain and promotes satiation. Also able to stimulate lipolysis in white adipocytes (By similarity). Also plays an important role in cellular osmoregulation: released into the systemic circulation in response to hyperosmolality and acts at different levels in the hypothalamus, pituitary and kidney to regulate water homeostasis (By similarity). Also plays a role in the central nervous system, possibly by acting as a neuropeptide hormone: required for hippocampal synaptic function and neural progenitor cells maintenance (By similarity).
  • Mechanism:  NA
  • Cross BBB:  NA
  • Target:  SCTR
  • Target Unid:  H0VT27
  • IC50: NA
  • EC50: NA
  • ED50: NA
  • kd: NA
  • Half life: NA

Structure

  • Disulfide bond:  NA
  • Structure ID:  AF-P63297-F1(AlphaFold_DB_ID)

  • Structure: (PDB_ID-from https://www.rcsb.org/; AlphaFold_DB_ID-from https://alphafold.ebi.ac.uk/; hordbxxxxxx_AF2.pdb was predicted structure by AlphaFold2; hordbxxxxxx_ESM.pdb was predicted structure by ESMFold)
    •    AF-P63297-F1.pdbhor005172_AF2.pdbhor005172_ESM.pdb

Physical Information

Mass: 352037 Formula: C130H219N43O42
Absent amino acids: CIKMNPWY Common amino acids: L
pI: 10.25 Basic residues: 5
Polar residues: 8 Hydrophobic residues: 9
Hydrophobicity: -46.3 Boman Index: -7818
Half-Life: 3.5 hour Half-Life Yeast: 10 min
Half-Life E.Coli: >10 hour Aliphatic Index 101.11
Instability Index: 6373.7 Extinction Coefficient cystines: 0
Absorbance 280nm: 0

Literature

  • PubMed ID:  2340294
  • Title:  Purification and amino acid sequence of vasoactive intestinal peptide, peptide histidine isoleucinamide (1-27) and secretin from the small intestine of guinea pig.