A major part of platelet-derived growth factor purified from human platelets is a heterodimer of one A and one B chain.

Platelet-derived growth factor, PDGF, purified from human platelets is a disulfide-bonded dimer consisting of two homologous polypeptide chains denoted A and B; it has not been known whether it is a heterodimer or a mixture of homodimers. We present here evidence that a major part of PDGF has a heterodimer structure. A highly homogeneous, 31-kDa PDGF was purified in the presence of protease inhibitors and shown to contain both chains by means of immunoprecipitations with peptide antisera specific for the A and B chains, respectively. The susceptibility of PDGF to mild acid treatment and its chromatographic behavior in reversed-phase high performance liquid chromatography and immobilized metal ion affinity chromatography, as compared to A and B chain homodimers, is consistent with a heterodimer structure. Analysis of PDGF purified according to our routine, large scale procedure revealed the major part to have a heterodimer structure. In addition, B chain homodimers were also found. With the demonstration that a major part of PDGF purified from human platelets occurs as a heterodimer, all three dimeric forms of PDGF have been identified. The following nomenclature to distinguish the various forms is suggested: PDGF-AA, a homodimer of A chains; PDGF-AB, a heterodimer; PDGF-BB, a homodimer of B chains; PDGF, any dimeric form of A or B chains.

• Publication year

  1988

• Venue

  Journal of Biological Chemistry

• Publication date

  1988-11-05

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1016/s0021-9258(18)37619-1PMID 2460450
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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