Directed evolution of a single-chain class II MHC product by yeast display

Scott E. Starwalt, Emma L. Mastellela, Jeffrey A. Bluestone, David M Kranz

Research output: Contribution to journalArticle

Abstract

Many autoimmune diseases have been linked to the class II region of the major histocompatibility complex (MHC). The linkage is thought to be a result of autoreactive T cells that recognize self-peptides bound to a product of this locus. For example, T cells from non-obese diabetic mice recognize specific 'diabetogenic' peptides bound to a class II MHC allele called I-Ag7. The I-Ag7 molecule is noted for being unstable and difficult to work with, especially in soluble form. In this work, yeast surface display combined with fluorescence-activated cell sorting was used as a means of directed evolution to engineer stabilized variants of a single-chain form of I-Ag7. A library containing mutations at two residues (positions 56 and 57 of the I-Ag7 β-chain) that are important in the class II disease associations yielded stabilized mutants with preferences for a glutamic acid at residue 56 and a leucine at residue 57. Random mutation of I-Ag7 followed by selection with an anti- I-Ag7 antibody also yielded stabilized variants with mutations in other residues. The methods described here allow the discovery of novel MHC complexes that could facilitate structural studies and provide new opportunities in the development of diagnostics or antagonists of class II MHC-associated diseases.

Original languageEnglish (US)
Pages (from-to)147-156
Number of pages10
JournalProtein Engineering
Volume16
Issue number2
StatePublished - Feb 1 2003

Fingerprint

Major Histocompatibility Complex
Yeast
T-cells
Yeasts
Display devices
Peptides
Mutation
T-Lymphocytes
Sorting
Antibodies
Leucine
Inbred NOD Mouse
Glutamic Acid
Fluorescence
Cells
Autoimmune Diseases
Libraries
Engineers
Flow Cytometry
Molecules

Keywords

  • Antigens
  • Class II
  • Major histocompatibility complex
  • Protein stability
  • Yeast display

ASJC Scopus subject areas

  • Molecular Biology
  • Biochemistry

Cite this

Starwalt, S. E., Mastellela, E. L., Bluestone, J. A., & Kranz, D. M. (2003). Directed evolution of a single-chain class II MHC product by yeast display. Protein Engineering, 16(2), 147-156.

Directed evolution of a single-chain class II MHC product by yeast display. / Starwalt, Scott E.; Mastellela, Emma L.; Bluestone, Jeffrey A.; Kranz, David M.

In: Protein Engineering, Vol. 16, No. 2, 01.02.2003, p. 147-156.

Research output: Contribution to journalArticle

Starwalt, SE, Mastellela, EL, Bluestone, JA & Kranz, DM 2003, 'Directed evolution of a single-chain class II MHC product by yeast display', Protein Engineering, vol. 16, no. 2, pp. 147-156.
Starwalt SE, Mastellela EL, Bluestone JA, Kranz DM. Directed evolution of a single-chain class II MHC product by yeast display. Protein Engineering. 2003 Feb 1;16(2):147-156.
Starwalt, Scott E. ; Mastellela, Emma L. ; Bluestone, Jeffrey A. ; Kranz, David M. / Directed evolution of a single-chain class II MHC product by yeast display. In: Protein Engineering. 2003 ; Vol. 16, No. 2. pp. 147-156.
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