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Related Experiment Videos

Differences in DNA sequence specificity among MHC class II X box binding proteins.

M Boothby1, H C Liou, L H Glimcher

  • 1Department of Cancer Biology, Harvard School of Public Health, Boston, MA 02155.

Journal of Immunology (Baltimore, Md. : 1950)
|February 1, 1989
PubMed
Summary
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Investigating major histocompatibility complex (MHC) class II gene regulation, this study reveals that while conserved X and Y box sequences are crucial, specific DNA-binding proteins alone don't fully explain gene expression. Multiple proteins bind MHC class II X boxes, with distinct specificities for different genes.

Area of Science:

  • Immunogenetics
  • Molecular Biology
  • Cellular Immunology

Background:

  • Class II (Ia) Major Histocompatibility Complex (MHC) antigens are integral membrane proteins crucial for immune response.
  • Conserved upstream sequences (X and Y boxes) regulate Ia gene expression, influencing tissue specificity and lymphokine inducibility.
  • Previous research indicated these sequences are vital for gene expression, but the exact regulatory mechanisms involving DNA-binding proteins remained unclear.

Purpose of the Study:

  • To investigate the role of sequence-specific DNA-binding proteins in the regulation of murine class II MHC gene expression.
  • To determine if the same set of proteins binds to conserved X box motifs across different class II MHC genes (A alpha, E alpha, E beta).
  • To elucidate the contribution of X and Y box binding factors to the lymphokine-mediated regulation of A alpha gene expression.

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Main Methods:

  • Gel retardation assays and DNase I footprinting were employed to analyze DNA-protein interactions.
  • Experiments utilized various cell types, including those expressing Ia antigens (Ia+) and those not (Ia-).
  • Cells were stimulated with lymphokines (IL-4 and IFN-gamma) to assess their impact on gene expression and protein binding.
  • Oligonucleotide probe binding and cross-competition experiments were conducted using X box sequences from A alpha, E alpha, and E beta genes.

Main Results:

  • Both X and Y box motifs are recognized by sequence-specific DNA-binding proteins, irrespective of cell type or lymphokine stimulation.
  • The availability of active X and Y box factors does not solely account for the regulation of A alpha expression.
  • DNA-protein complexes formed with X box sequences from A alpha, E alpha, and E beta genes exhibited unique mobilities and specificities, indicating distinct binding proteins.
  • A faint, common complex was observed across all three X box probes, suggesting a potential communal binding protein with varying affinities.

Conclusions:

  • Multiple proteins bind to class II MHC X boxes, rather than a single universal factor.
  • The predominant DNA-protein complexes for the A alpha gene display different specificities compared to those for E alpha and E beta genes.
  • These findings suggest a complex regulatory network involving multiple DNA-binding proteins with distinct specificities for class II MHC gene regulation.