Articles
Explore our collection of 89 articles covering peptide biology, chemistry, pharmacology, and more.
Amino Acid Analytical Methods
A guide to the principal analytical techniques for amino acid analysis including HPLC, capillary electrophoresis, mass spectrometry, and standardized protocols.
Amino Acid Charge at Physiological pH
Understanding how amino acids carry charge at physiological pH is essential for grasping protein structure and function.
Essential vs Non-Essential Amino Acids
A complete guide to the 20 standard amino acids, their dietary classification, and the mnemonic that makes them unforgettable.
Amino Acid Classification Systems
Learn the various ways to classify the 20 standard amino acids by polarity, charge, structure, and metabolic pathway, with practical mnemonics for memorization.
Amino Acid Hydrophobicity Scales
An overview of major hydrophobicity scales including Kyte-Doolittle, Eisenberg, and Wimley-White, and their applications in membrane protein prediction.
Amino Acid Metabolism
Amino acid metabolism encompasses pathways for energy production, biosynthesis, and nitrogen disposal.
Amino Acid pKa Values
pKa values determine the protonation state of amino acid side chains and backbone groups, critical for predicting charge states and reactivity.
Amino Acid Post-Translational Modifications
An overview of post-translational modifications including phosphorylation, glycosylation, acetylation, and ubiquitination.
Amino Acid Racemization
Explore D-amino acids in nature, racemase enzymes, the role of racemization in food chemistry, and applications in dating archaeological specimens.
Amino Acid Side Chains
Learn how the 20 standard amino acids are classified by side chain properties and how these properties drive protein folding and function.
Amino Acid Transporters
Learn about the SLC family of amino acid transporters, system A/B/L classification, brain transport mechanisms, and intestinal absorption processes.
Understanding Amino Acids
A beginner-friendly guide to the 20 standard amino acids — the building blocks of all peptides and proteins.
Antimicrobial Peptide Resistance
Antimicrobial peptides face unique resistance challenges due to their membrane-targeting mechanisms, though resistance remains rare.
Antimicrobial Peptides
Learn about antimicrobial peptides — their structures, membrane-disruption mechanisms, role in innate immunity, and low potential for resistance development.
Blood-Brain Barrier and Peptides
The blood-brain barrier presents formidable challenges for peptide therapeutics, but cell-penetrating peptides offer delivery solutions.
BPC-157 vs KPV: Gut Health Comparison
Comparative analysis of BPC-157 and KPV for gastrointestinal healing, examining mechanisms of action, clinical evidence, and therapeutic applications.
Circular Dichroism Spectroscopy
Circular dichroism determines peptide and protein secondary structure by measuring differential absorption of circularly polarized light.
CJC-1295 vs MK-677: Combination Analysis
Comparative analysis of CJC-1295 and MK-677 as growth hormone secretagogues, examining their pharmacological profiles and combination potential.
Collagen Peptides
Learn about collagen structure, hydrolyzed collagen supplements, their evidence-based benefits for skin and joint health, and practical considerations for use.
Disulfide Bonds
Understand how covalent disulfide bonds form between cysteine residues, stabilize protein structure, and participate in redox biology.
Drug Design Principles for Peptide Therapeutics
From SAR to ADMET -- the core principles of rational drug design applied to peptide-based therapeutics.
Endogenous Peptide Drugs
Naturally occurring peptides like insulin, oxytocin, vasopressin, and calcitonin serve as the basis for important therapeutic agents.
Enzyme Kinetics Basics
Michaelis-Menten kinetics, Km, Vmax, enzyme inhibition types, and their relevance to peptide drug design.
Gastrointestinal Peptides
A survey of the major GI hormones — gastrin, CCK, secretin, GIP, and GLP-1 — their sources, functions, and clinical significance.
GHRP-6 vs Ipamorelin: Side Effect Profiles
Comparative analysis of GHRP-6 and ipamorelin side effect profiles, covering growth hormone secretagogue adverse events and clinical considerations.
Glucose-Dependent Insulinotropic Polypeptide
GIP is an incretin hormone that enhances glucose-stimulated insulin secretion and forms the basis of dual agonist therapies alongside GLP-1 receptor activation.
G-Protein Coupled Receptors
G-protein coupled receptors are the largest family of drug targets, mediating diverse physiological responses through G-protein and second messenger signaling.
HPLC Purification
Learn the principles of reversed-phase, normal-phase, and ion-exchange HPLC for peptide purification, including gradient elution strategies and practical tips.
Hydrogen Bonding
Understand hydrogen bonds in proteins, water, and DNA. Learn the strength, geometry, and biological importance of hydrogen bonding in biomolecular structures.
Hydrophobic Interactions
Learn how hydrophobic interactions drive protein folding through the hydrophobic effect, thermodynamic principles, and entropic forces.
Insulin Aspart vs Lispro: Onset Time
Comparative analysis of insulin aspart and insulin lispro rapid-acting insulin analogs, focusing on onset time, pharmacokinetics, and clinical use.
Insulin Glargine U-100 vs U-300
Comparison of insulin glargine at 100 U/mL and 300 U/mL concentrations, covering pharmacokinetics and clinical implications.
Ion Channels and Peptides
Explore ion channels, how peptide toxins serve as experimental probes, and pharmacological significance of channel modulation.
Mass Spectrometry for Peptides
Master MALDI-TOF and ESI-MS techniques for peptide analysis, including peptide fingerprinting, de novo sequencing, and practical interpretation of mass spectra.
Melanotan I vs Melanotan II: Tanning Efficacy
Comparative analysis of Melanotan I and Melanotan II for tanning efficacy, covering melanogenesis mechanisms, dosing protocols, and side effect profiles.
Neuropeptide Signaling
Understand paracrine versus endocrine neuropeptide signaling, receptor diversity, signal termination mechanisms, and their roles in neural communication.
NMR Spectroscopy for Peptides
Nuclear magnetic resonance spectroscopy using 1H NMR, COSY, and NOESY experiments provides atomic-resolution structure determination of peptides in solution.
Opioid Peptide Pharmacology
Endogenous opioid peptides including endorphins, enkephalins, and dynorphins modulate pain, mood, and reward through mu, delta, and kappa receptors.
Oxytocin vs Carbetocin: Postpartum Use
Comparative analysis of oxytocin and carbetocin for postpartum hemorrhage prevention and treatment, covering pharmacology, clinical efficacy, and safety.
Peptide Aggregation
Peptide aggregation into amyloid fibrils underlies diseases like Alzheimer's and Parkinson's, driven by beta-sheet stacking.
Peptide Bond Formation Energetics
Peptide bond formation is thermodynamically unfavorable and requires energy input through ATP coupling and activation strategies.
Peptide Bond Energy Diagram
Understanding the energy landscape of peptide bond formation and hydrolysis, including activation energy, transition states, and enzyme catalysis mechanisms.
Peptide Bond in Enzyme Catalysis
How enzymes catalyze peptide bond formation and hydrolysis through transition state stabilization and catalytic triads.
Peptide Bond in Extreme Environments
How peptide bonds withstand extreme conditions including high temperature, high pressure, and thermophilic organism adaptations.
Peptide Bond Geometry Analysis
A guide to peptide bond geometry including phi/psi angles, Ramachandran plots, and NMR methods for conformational analysis.
Peptide Bond Geometry in Drug Design
How peptide bond geometry influences drug design through bioisosteres, peptidomimetics, and conformational constraint strategies.
Peptide Bond Hydrolysis
Peptide bond hydrolysis is the fundamental reaction that breaks proteins into smaller peptides or amino acids, catalyzed by proteases and chemical methods.
Peptide Bond Isomerization
Explore cis-trans isomerization of peptide bonds, the role of prolyl isomerase in protein folding, and how this process affects folding kinetics and dynamics.
Peptide Bond in Non-Aqueous Solvents
How organic solvents, ionic liquids, and deep eutectic solvents affect peptide bond formation, stability, and synthesis applications.
Peptide Bond Rotation
Peptide bond rotation is restricted due to partial double-bond character, limiting conformational freedom and defining protein structural constraints.
Peptide Bond Rotation Energy Barriers
Energy barriers governing rotation around peptide bonds, including rotational isomeric states and energy profiles.
Peptide Bond Chemistry
Understanding the amide bond that links amino acids: resonance, planar geometry, and the Ramachandran plot.
Chirality in Peptides
Amino acids in natural peptides are almost exclusively L-isomers. Understanding chirality and biological significance of D-forms.
Peptide Bond Dipole Moment
The peptide bond carries a significant electric dipole moment from resonance between the carbonyl and amide nitrogen.
Peptide Drug Delivery
Explore oral, nasal, transdermal, nanoparticle, and depot injection strategies for delivering peptide therapeutics, including barriers and innovative solutions.
Peptide-Drug Interactions
Peptide-drug interactions describe how therapeutic peptides bind to molecular targets, covering binding models and affinity metrics.
Peptide Drug Manufacturing
Overview of GMP production, quality control processes, batch consistency requirements, and regulatory considerations for manufacturing therapeutic peptides.
Peptide Drug Modifications
Explore chemical strategies to improve peptide drug pharmacokinetics, including D-amino acid substitution, cyclization, PEGylation, and fatty acid conjugation.
Peptide Bond Electronegativity
Understanding electronegativity differences between oxygen and nitrogen in peptide bonds and their influence on chemical reactivity.
Peptide Folding Pathways
Peptide folding through energy landscapes, folding funnels, molten globule intermediates, and thermodynamic guiding factors.
Peptide Fragmentation in Mass Spectrometry
Understanding b/y ion series, CID fragmentation mechanisms, and de novo sequencing principles is essential for peptide identification in proteomics experiments.
Peptide-Based Gene Delivery
An exploration of cell-penetrating peptides, polyplexes, endosomal escape mechanisms, and nuclear targeting strategies for non-viral gene delivery.
Peptide Stability in the GI Tract
The gastrointestinal tract presents formidable barriers to oral peptide delivery through enzymatic degradation and poor absorption.
Peptide Bond IR Spectroscopy
Infrared spectroscopy identifies peptide bonds through amide I and II bands, with applications in secondary structure analysis.
Peptide Libraries in Drug Discovery
How peptide libraries using combinatorial chemistry, phage display, and mRNA display accelerate the identification of therapeutic candidates.
Peptide Mimetics for Neuroscience
An overview of neuropeptide mimetics, strategies for CNS penetration, and approaches to achieving receptor selectivity in neurological drug design.
Peptide Oral Bioavailability
Challenges and strategies for improving oral peptide delivery, including permeation enhancers, enzyme inhibitors, and formulation approaches.
Peptide-Protein Interactions
Peptides bind proteins at defined interfaces involving hotspot residues. Computational docking and alanine scanning characterize these interactions.
Peptide Purification Strategies
A practical guide to peptide purification methods including RP-HPLC, ion exchange chromatography, and size exclusion chromatography.
Peptide Quantification Methods
Accurate peptide quantification is essential for research and pharmaceutical applications, with multiple assay methods available.
Peptide-Receptor Binding Kinetics
Understanding kon and koff rates, residence time, and kinetic selectivity in peptide-receptor interactions and their implications for drug design.
Peptide Bond Resonance Structures
Understanding resonance contributors in peptide bonds, charge separation effects, and how resonance enforces the planarity of the peptide bond.
Peptide Stability
Peptide stability encompasses degradation pathways, aggregation mechanisms, and storage strategies that determine peptide shelf life and biological activity.
Peptide Stability Testing
Peptide stability testing determines how therapeutic peptides degrade over time and under stress conditions.
Peptide Synthesis Methods
Compare SPPS, liquid-phase synthesis, and recombinant production methods for creating peptides and small proteins.
Peptide-Targeted Drug Delivery
How peptide ligands like RGD and transferrin direct therapeutic agents to specific tissues for improved drug delivery.
Peptide Bond Tautomerism
Exploring keto-enol and imine-enamine tautomerism in peptides, including rare tautomeric forms that influence peptide structure and reactivity.
Peptide Thermal Stability
Methods for assessing peptide thermal stability including DSC, CD melting curves, and aggregation analysis, plus practical storage recommendations.
Peptide Vaccines
Peptide vaccines use synthetic peptide epitopes to stimulate targeted immune responses, offering advantages in safety and manufacturing.
Protein Folding Thermodynamics
Protein folding is governed by thermodynamic principles that determine how a linear polypeptide chain achieves its native three-dimensional structure.
Protein Misfolding Diseases
Learn about amyloidosis, prion diseases, and neurodegenerative disorders caused by protein misfolding, including mechanisms and therapeutic strategies.
Protein Structure Levels
From primary sequence to quaternary assembly -- the four hierarchical levels of protein structure explained with examples.
Receptor Pharmacology
Receptor pharmacology explains how drugs interact with receptors to produce biological effects, covering agonists, antagonists, and partial agonists.
Peptide Bond Formation in the Ribosome
The ribosome catalyzes peptide bond formation at the peptidyl transferase center using A, P, and E sites during translation.
Semaglutide vs Liraglutide: Cardiovascular Outcomes
Comparative analysis of cardiovascular outcomes data for semaglutide and liraglutide, covering LEADER, SUSTAIN-6, PIONEER-6, SELECT, and other landmark trials.
Signal Peptides
Signal peptides are short N-terminal sequences that direct newly synthesized proteins to the endoplasmic reticulum for secretion or membrane insertion.
Therapeutic Peptide Oral Delivery
Explore strategies for oral delivery of therapeutic peptides, including permeation enhancers, enzyme inhibitors, and nanoparticle encapsulation methods.
Thymosin Alpha-1 vs Interferon: Immune Modulation
Comparative analysis of thymosin alpha-1 and interferon-alpha for immune modulation, covering mechanisms of action, clinical applications, and efficacy data.
VIP vs Sildenafil: Erectile Dysfunction
Comparison of vasoactive intestinal peptide and sildenafil for erectile dysfunction, covering mechanisms and clinical efficacy.