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Related Concept Videos

Factors Affecting Protein-Drug Binding: Protein-Related Factors01:20

Factors Affecting Protein-Drug Binding: Protein-Related Factors

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Drug binding to proteins is a key aspect of pharmacokinetics and can influence a drug's distribution, absorption, and elimination in the body. Several factors, including the drug's physiochemical properties, protein concentration, disease states, and the number of binding sites on the protein, influence this process.
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The Equilibrium Binding Constant and Binding Strength02:18

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Drugs predominantly attach to plasma proteins, with only a small percentage remaining unbound. The unbound portion can be calculated as one minus the bound fraction. Acidic drugs form large, inactive complexes by reversibly binding to plasma albumin, which prevents them from diffusing across biological barriers. These drug-protein complexes act as reservoirs for the drugs. As the concentration of unbound drugs decreases, these complexes quickly dissociate to release the free drug, maintaining...
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Determining protein-drug binding can be achieved through indirect and direct methods, each providing valuable insights into the interaction between proteins and drugs.
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For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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Protein-Drug Binding: Mechanism and Kinetics01:16

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Protein-drug binding refers to the interaction between drugs and proteins within the body. This binding process can occur intracellularly, involving drug interactions with enzymes or receptors within cells, or extracellularly, involving plasma proteins in the blood.
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IGF-Binding Proteins: Why Do They Exist and Why Are There So Many?

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  • 1Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI, United States.

Frontiers in Endocrinology
|April 25, 2018
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Summary

Insulin-like growth factors (IGFs) and their binding proteins (IGFBPs) fine-tune growth signaling. Diverse IGFBP functions likely evolved for precise IGF regulation during stress, explaining limited insights from standard loss-of-function studies.

Keywords:
evolutioninsulin-like growth factorinsulin-like growth factor 1 receptorinsulin-like growth factor signalinginsulin-like growth factor-binding protein

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Cell Signaling

Background:

  • Insulin-like growth factors (IGFs) are crucial peptides for growth, acting as hormones and local factors.
  • Most IGFs circulate bound to IGF-binding proteins (IGFBPs), which regulate IGF availability and signaling.
  • Six distinct IGFBP types exist, each with unique structures, roles, and regulatory mechanisms.

Purpose of the Study:

  • To review the diverse roles of IGF-binding proteins (IGFBPs) in regulating insulin-like growth factor (IGF) signaling.
  • To explore the hypothesis that IGFBPs evolved for fine-tuning IGF activity, particularly under stress.
  • To address the puzzle of limited information from loss-of-function studies regarding IGFBP physiological functions.

Main Methods:

  • Literature review of existing research on IGFs and IGFBPs.
  • Analysis of sequence homology, structural features, and expression patterns of IGFBP family members.
  • Examination of evidence for IGF-dependent and IGF-independent actions of IGFBPs.
  • Discussion of the implications of IGFBP diversity for IGF signaling regulation.

Main Results:

  • IGFBPs bind IGFs with high affinity, increasing IGF half-life and blocking insulin receptor interaction.
  • IGFBPs modulate IGF signaling locally and can exert IGF-independent effects via their own receptors or intracellular actions.
  • Despite sequence homology, IGFBPs exhibit distinct functions, regulation, and expression patterns.
  • Loss-of-function studies have provided limited insight into the physiological roles of IGFBPs.

Conclusions:

  • The array of IGFBPs likely evolved to enable fine-tuning of IGF signaling.
  • Many IGFBP functions may be adapted for targeted adjustment of IGF signaling under specific stressful or irregular conditions.
  • Standard laboratory settings may not fully reveal the physiological relevance of diverse IGFBP functions.