Preparation and Properties of M-Line Proteins

Hans M. Eppenberger, Emanuel Strehler

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5 Scopus citations


This chapter provides the preparation and properties of M-Line proteins. Neither the protein composition nor the detailed function of the M line, the electron-dense structure running transversely through the middle of the H-zone of the sarcomere of cross-striated muscle, is yet fully known. So far only two proteins—the M-type isoprotein of creatine kinase (MM-CK) and the Mr = 165,000 protein now called myomesin—have been identified as true M-line proteins. The procedures for the preparation of total creatine kinase from rabbit muscle, from chicken skeletal and heart muscle as well as from chicken brain is described in this chapter.The purification of the M-line MM-CK is best achieved by first preparing well-washed isolated myofibrils from which MM-CK can then be extracted. It is found that ability of antibodies to distinguish between the MM and the BB isoenzymes of CK can be used to detect specifically one or the other homodimeric enzyme by several immunological techniques, such as immune overlay technique, indirect immunofluorescence technique, and immune electron microscopy.

Original languageEnglish (US)
Pages (from-to)139-149
Number of pages11
JournalMethods in enzymology
Issue numberC
StatePublished - Jan 1 1982

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology


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