What question did this study set out to answer?

To characterize the structural, conformational, and subunit interaction differences between the electrophoretically slow and fast forms of human alpha 2-macroglobulin.

August 1, 1979Biochemical JournalOpen Access

The electrophoretically ‘slow’ and ‘fast’ forms of the α2-macroglobulin molecule

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Authors

ABA. John BarrettHuman Genome Sciences (United States)MBM A BrownUniversity of Dundee CSC A SayersTissue Genetics (United States)

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Implication

In vitro biochemical analysis demonstrates conformational compaction during the transition from slow to fast alpha 2-macroglobulin, indicating tighter subunit interactions upon proteinase entrapment.

Key Points

To characterize the structural, conformational, and subunit interaction differences between the electrophoretically slow and fast forms of human alpha 2-macroglobulin.
Purified native slow-form alpha 2-macroglobulin (S-alpha 2M) from human plasma using polyethylene glycol fractionation, gel chromatography, euglobulin precipitation, and immunoadsorption.
Generated the fast form (F-alpha 2M) through treatment with proteinases (such as trypsin) or ammonium/methylammonium salts.
Analyzed molecular conformation, subunit nicking, cross-linking, and dissociation stability using gel electrophoresis, SDS-PAGE, glutaraldehyde cross-linking, urea, low pH, and mild thiol reduction.
Transition from S-alpha 2M to F-alpha 2M produced increased electrophoretic mobility and reduced rocket immunoelectrophoresis heights by 12–29% without altering the isoelectric point or Stokes radius.
Glutaraldehyde treatment induced substantially greater cross-linking in F-alpha 2M, demonstrating that the tetrameric subunits interact more closely than in S-alpha 2M.
F-alpha 2M resisted dissociation by 3 M-urea, pH 3, or mild reduction, whereas S-alpha 2M readily dissociated into non-binding half-molecules or quarter-subunits.

Cite This Study

Barrett et al. (1979) studied this question.

synapsesocial.com/papers/6a8198675fe02a08f3d81d0a https://doi.org/10.1042/bj1810401

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Implication

In vitro biochemical analysis demonstrates conformational compaction during the transition from slow to fast alpha 2-macroglobulin, indicating tighter subunit interactions upon proteinase entrapment.

The electrophoretically ‘slow’ and ‘fast’ forms of the α2-macroglobulin molecule

Discussion

Member takes

Implication

Key Points

Cite This Study

The electrophoretically ‘slow’ and ‘fast’ forms of the α2-macroglobulin molecule

Discussion

Member takes

Implication

Key Points

Cite This Study

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Also Consider