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Peptides are chains formed of principally α-amino acids linked by amide bonds. Peptides are normally composed of the 20 naturally occurring L-amino acids, but may also contain D-amino acids, unnatural amino acids, disulfide bridges, be linear or cyclic, or be further chemically modified. Numerous peptides exist in all living organisms where they perform a multitude of biological functions.

Peptide Search

Search by Single Letter Code, Three Letter Code or Peptide Name.

Peptides by Pharmacological Activity

14.3.3 Proteins Actin Adenylyl Cyclases Adrenergic α1 Receptors Akt (Protein Kinase B) AMPA Receptors AMPK Amyloid β Peptides Angiotensin AT2 Receptors Angiotensin-Converting Enzyme Antiangiogenics Antibiotics Antivirals AP-1 Apelin Receptors Acid-Sensing Ion Channels Autophagy Bcl-2 Family Bombesin Receptors Bradykinin Receptors Broad Spectrum Protein Kinase Inhibitors Buffers, Solvents and Solutions Calcium-Activated Potassium (KCa) Channels Calcitonin and Related Receptors Calcium Binding Protein Modulators Calcium-Sensitive Protease Modulators Calpains CaM Kinase Caspases CB1 Receptors CCK1 Receptors CCK2 Receptors Cell Adhesion Molecules Chemokine CC Receptors Chemokine CXC Receptors Chloride Channels Complement CRF1 Receptors CRF2 Receptors Cyclin-Dependent Protein Kinases Cytokine Receptors Death-Associated Protein Kinase δ Opioid Receptors Dopaminergic-Related ETA Receptors ETB Receptors Enzyme Substrates / Activators Eph Receptors Fluorescent Probes Formyl Peptide Receptors G Proteins (Heterotrimeric) G Proteins (Small) Galanin Receptors Gap Channels Ghrelin Receptors GIP Receptor Glucagon Receptors Glucagon-Like Peptide 1 Receptors Glucagon-Like Peptide 2 Receptors Glycogen Synthase Kinase 3 Gonadotropin-Releasing Hormone Receptors GTPases Guanylyl Cyclases Hypoxia Inducible Factors Inflammasomes Inositol Lipids Insulin and Insulin-like Receptors Integrin Receptors Inward Rectifier Potassium (Kir) Channels JNK/c-Jun Kainate Receptors κ Opioid Receptors Kisspeptin Receptor LDL Receptors Leptin Receptors
Melanin-concentrating Hormone Receptors Melanocortin (MC) Receptors MET Receptors Miscellaneous Compounds Miscellaneous Opioids Mitosis Motilin Receptor μ Opioid Receptors Myosin Light Chain Kinases NADPH Oxidase Natriuretic Peptide Receptors Neuromedin U Receptors Neuronal Metabolism Neuropeptide FF/AF Receptors Neurotensin Receptors NFAT NF-κB and IκB Nicotinic (α7) Receptors Nicotinic Receptors (Non-selective) Nicotinic Receptors (Other Subtypes) NK1 Receptors NK2 Receptors NK3 Receptors NMDA Receptors Non-selective / Other Potassium Channels Non-selective AT Receptors Non-selective CCK Non-selective CRF Receptors Non-selective Endothelin Non-selective Orexin NOP Receptors NPY Receptors Nrf2 Orphan 7-TM Receptors Other Angiotensin Receptors Other Apoptosis Other Channel Modulators Other Hydrolases Other Kinases Other Peptide Receptors Other Proteases Other Tachykinin Other Wnt Signaling OX1 Receptors OX2 Receptors Oxytocin Receptors Purinergic (P2X) Receptors PACAP Receptors Parathyroid Hormone Receptors PI 3-kinase Pim Kinase Post-translational Modifications Protease-Activated Receptors Protein Arginine Methyltransferases Protein Kinase A Protein Kinase C Protein Kinase G Protein Ser/Thr Phosphatases Secretin Receptors Sensory Neuron-Specific Receptors Somatostatin (sst) Receptors Src Kinases STATs Toll-like Receptors Translocation, Exocytosis & Endocytosis Trk Receptors TRPC TRPV Urotensin-II Receptors Vasopressin Receptors VIP Receptors Voltage-gated Calcium Channels (CaV) Voltage-gated Potassium (KV) Channels Voltage-gated Sodium (NaV) Channels

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