Domain structure of a mammalian myosin Iβ

Ofer Reizes, Barbara Barylko, Cai Li, Thomas C. Südhof, Joseph P. Albanesi

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


We have determined the primary structure of a myosin I (called mammalian myosin Iβ, MMIβ) from bovine brain and identified its functional domains. The protein was previously purified from brain and adrenal gland. Several constructs were generated and expressed in Escherichia coli as glutathione S- transferase fusion proteins and the recombinant proteins were recognized by monoclonal antibodies that recognize either 'head' or 'tail' domains of native myosin I. A gel overlay method was used to confirm that calmodulin binds to the consensus calmodulin-binding sequence in MMIβ. Binding assays were used to detect interaction with anionic phospholipid vesicles. We conclude that MMIβ consists of an amino-terminal 80.5-kDa domain that contains the ATP- and actin-binding sites, followed by an 8.5-kDa domain with three calmodulin-binding sequences and a basic 30-kDa carboxyl-terminal tail segment that binds to anionic phospholipids and membranes.

Original languageEnglish (US)
Pages (from-to)6349-6353
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number14
StatePublished - Jul 5 1994


  • calmodulin binding
  • phospholipid binding

ASJC Scopus subject areas

  • General


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