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Related Experiment Videos

Plasminogen: a brief introduction into its biochemistry and function.

C Miyashita1, E Wenzel, M Heiden

  • 1Abt. für Klinische Haemostaseologie und Transfusionsmedizin, Universitätskliniken, Homburg/Saar, FRG.

Haemostasis
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

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Human plasminogen (Glu-plasminogen) is a protein synthesized in various organs, with levels varying by age. Its structure influences its function, differentiating it from modified forms like Lys-plasminogen.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Hematology

Background:

  • Human plasminogen is a beta-globulin with a molecular weight of 90 kDa, containing 2% carbohydrate.
  • Native plasminogen (Glu-plasminogen) has an NH2-terminal glutamic acid and its primary structure is known.
  • Plasminogen is synthesized in organs including the liver, eosinophils, and kidneys.

Purpose of the Study:

  • To describe the characteristics of human plasminogen.
  • To outline its isolation and structural properties.
  • To discuss its physiological concentrations and half-life.

Main Methods:

  • Isolation of plasminogen using affinity chromatography techniques.
  • Analysis of plasminogen structure and variants.
  • Determination of plasma concentrations and half-life.

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Main Results:

  • Native Glu-plasminogen has a half-life of 2.24 days and occurs in two types differing in carbohydrate and sialic acid content.
  • Genetic variants of plasminogen have been identified through isoelectric focusing.
  • Glu-plasminogen converts to Lys-plasminogen (half-life 0.8 days) via limited plasmic digestion.

Conclusions:

  • Human plasminogen exhibits structural diversity influencing its function.
  • Its concentration and half-life vary significantly between newborns and adults.
  • Understanding plasminogen structure is key to its biological activity, including fibrin specificity.