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Peptides as affinity surfaces for protein purification

A Pingali1, B McGuinness, H Keshishian

  • 1PerSeptive Biosystems, Framingham, MA-01701, USA.

Journal of Molecular Recognition : JMR
|September 1, 1996
PubMed
Summary
This summary is machine-generated.

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Researchers developed novel affinity chromatography media by synthesizing peptides directly onto POROS resin. This method efficiently captures fibrinogen and albumin, demonstrating its potential for protein purification under non-denaturing conditions.

Area of Science:

  • Biochemistry
  • Chromatography
  • Protein Purification

Background:

  • The tetrapeptide GPRP is a known affinity ligand for fibrinogen when immobilized.
  • Peptide synthesis directly onto chromatographic resins offers a novel approach for creating affinity media.

Purpose of the Study:

  • To demonstrate the effectiveness of synthesizing peptides directly onto amine-functionalized POROS resin for creating perfusive affinity media.
  • To evaluate the binding capacity and specificity of GPRP-POROS and GAQGHTVEK-POROS columns for fibrinogen and albumin, respectively.

Main Methods:

  • Synthesis of the GPRP peptide directly onto an amine-functionalized POROS resin.
  • Synthesis of a simplified peptide analogue GAQGHTVEK directly onto POROS resin.
  • Frontal analysis was used to determine the dynamic binding capacity of the columns.

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Main Results:

  • The GPRP-POROS column demonstrated specific binding of fibrinogen from plasma with a dynamic binding capacity of 10.2 mg/ml, and eluted bound fibrinogen showed weak clotting activity.
  • The GAQGHTVEK-POROS column specifically bound human serum albumin with a dynamic binding capacity of 19 mg/ml, allowing purification under non-denaturing conditions.
  • Both peptide columns showed specificity, not binding denatured fibrinogen and purifying albumin under non-denaturing conditions.

Conclusions:

  • Direct peptide synthesis onto POROS resin is an effective method for generating perfusive affinity media.
  • These novel affinity media exhibit high binding capacities and specificity for target proteins like fibrinogen and albumin.
  • This approach offers a promising strategy for efficient and non-denaturing protein purification.