Abstract
Pulse–chase analysis is a commonly used technique for studying the synthesis, processing and transport of proteins. Cultured cells expressing proteins of interest are allowed to take up radioactively labeled amino acids for a brief interval (“pulse”), during which all newly synthesized proteins incorporate the label. The cells are then returned to nonradioactive culture medium for various times (“chase”), during which proteins may undergo conformational changes, trafficking, or degradation. Proteins of interest are isolated (usually by immunoprecipitation) and resolved by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE), and the fate of radiolabeled molecules is examined by autoradiography. This chapter describes a pulse–chase protocol suitable for studies of major histocompatibility complex (MHC) class II biosynthesis and maturation. We discuss how results are affected by the recognition by certain anti-class II antibodies of distinct class II conformations associated with particular biosynthetic states. Our protocol can be adapted to follow the fate of many other endogenously synthesized proteins, including viral or transfected gene products, in cultured cells.
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Abbreviations
- MHC:
-
Major histocompatibility complex
- ER:
-
Endoplasmic reticulum
- Abs:
-
Antibodies
- Ii:
-
Invariant chain
- B-LCL:
-
EBV-transformed B-lymphoblastoid cell lines
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- MIIC:
-
MHC class II compartments
- LIP:
-
Leupeptin-induced polypeptides
- CLIP:
-
Class-II-associated invariant chain peptides
- Cys/Met:
-
Cysteine/methionine
- PAS:
-
Protein A Sepharose
- PGS:
-
Protein G Sepharose
- IP:
-
Immunoprecipitation
- APCs:
-
Antigen presenting cells
- SLB:
-
Laemmli sample loading buffer
- PMSF:
-
Phenylmethylsulfonyl fluoride
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Acknowledgments
This work was supported by NIH grants F32 AI089090 to TH and AI095813 and AI28809 to E.D.M. R.B. was supported by a Senior Research Fellowship from Arthritis Research UK (ref. 18543).
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Hou, T., Rinderknecht, C.H., Hadjinicolaou, A.V., Busch, R., Mellins, E. (2013). Pulse–Chase Analysis for Studies of MHC Class II Biosynthesis, Maturation, and Peptide Loading. In: van Endert, P. (eds) Antigen Processing. Methods in Molecular Biology™, vol 960. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-62703-218-6_31
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DOI: https://doi.org/10.1007/978-1-62703-218-6_31
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