Journal of Muscle Research & Cell Motility

, Volume 21, Issue 5, pp 405–414 | Cite as

Effect of intramolecular cross-linking between glutamine-41 and lysine-50 on actin structure and function

  • Luba Eli-Berchoer
  • György Hegyi
  • András Patthy
  • Emil Reisler
  • Andras Muhlrad
Article

Abstract

Subdomain 2 of actin is a dynamic segment of the molecule. The cross-linking of Gln-41 on subdomain 2 to Cys-374 on an adjacent monomer in F-actin inhibits actomyosin motility and force generation (Kim et al., 1998; Biochemistry 37, 17,801–17,809). To shed light on this effect, additional modifications of the Gln-41 site on actin were carried out. Both intact G-actin and G-actin cleaved by subtilisin between Met-47 and Gly-48 in the DNase 1 binding loop of subdomain 2 were treated with bacterial transglutaminase. According to the results of Edman degradation, transglutaminase introduced an intramolecular zero-length cross-linking between Gln-41 and Lys-50 in both intact and subtilisin cleaved actins. This cross-linking perturbs G-actin structure as shown by the inhibition of subtilisin and tryptic cleavage in subdomain 2, an allosteric inhibition of tryptic cleavage at the C-terminus and decrease of modification rate of Cys-374. The cross-linking increases while the subtilisin cleavage dramatically decreases the thermostability of F-actin. The Mg- and S1-induced polymerizations of both intact and subtilisin cleaved actins were only slightly influenced by the cross-linking. The activation of S1 ATPase by actin and the sliding speeds of actin filaments in the in vitro motility assays were essentially unchanged by the cross-linking. Thus, although intramolecular cross-linking between Gln-41 and Lys-50 perturbs the structure of the actin monomer, it has only a small effect on actin polymerization and its interaction with myosin. These results suggest that the new cross-linking does not alter the intermonomer interface in F-actin and that changes in actomyosin motility reported for the Gln-41–Cys-374 intrastrand cross-linked actin are not due to decreased flexibility of loop 38–52 but to constrains introduced into the F-actin structure and/or to perturbations at the actin's C-terminus.

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Luba Eli-Berchoer
    • 1
  • György Hegyi
    • 2
  • András Patthy
    • 3
  • Emil Reisler
    • 4
  • Andras Muhlrad
    • 1
  1. 1.Department of Oral Biology, Institute of Dental Sciences, HebrewUniversity Hadassah School of Dental MedicineJerusalemIsrael
  2. 2.Department of BiochemistryEötvös Loránd UniversityBudapestHungary
  3. 3.Agricultural Biotechnology CenterGödöllöHungary
  4. 4.Department of Chemistry and Biochemistry and the Molecular Biology InstituteUniversity of CaliforniaLos AngelesUSA

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