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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Gatti, J. L. Moss, A. G. Witman, G. B. |
| Description | Author Affiliation: Moss AG ( Cell Biology Group and Male Fertility Program, Worcester Foundation for Experimental Biology, Shrewsbury, Massachusetts 01545.) |
| Abstract | We used in vitro translocation and cosedimentation assays to study the microtubule binding properties of sea urchin sperm outer arm dynein and its beta/IC1 subunit. Microtubules glided on glass-absorbed sea urchin dynein for a period of time directly proportional to the initial MgATP2- concentration and then detached when 70-95% of the MgATP2- was hydrolyzed. Detachment resulted from MgATP2- depletion, because (a) perfusion with fresh buffer containing MgATP2- reconstituted binding and gliding, (b) microtubules glided many minutes with an ATP- regenerating system at ATP concentrations which alone supported gliding for only 1-2 min, and (c) microtubules detached upon total hydrolysis of ATP by an ATP-removal system. The products of ATP hydrolysis antagonized binding and gliding; as little as a threefold excess of ADP/Pi over ATP resulted in complete loss of microtubule binding and translocation by the beta/IC1 subunit. In contrast to the situation with sea urchin dynein, microtubules ceased gliding but remained bound to glass-absorbed Tetrahymena outer arm dynein when MgATP2- was exhausted. Cosedimentation assays showed that Tetrahymena outer arm dynein sedimented with microtubules in an ATP-sensitive manner, as previously reported (Porter, M.E., and K. A. Johnson. J. Biol. Chem. 258: 6575-6581). However, the beta/IC1 subunit of sea urchin dynein did not cosediment with microtubules in the absence of ATP. Thus, this subunit, while capable of generating motility, lacks both structural and rigor-type microtubule binding. |
| ISSN | 00219525 |
| e-ISSN | 15408140 |
| Journal | The Journal of Cell Biology |
| Issue Number | 5 |
| Volume Number | 118 |
| Language | English |
| Publisher | Rockefeller University Press (United States) |
| Publisher Date | 1992-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Dyneins Metabolism Microtubules Sperm Tail Enzymology Adenosine Triphosphate Pharmacology Animals Centrifugation, Density Gradient Chemistry Hydrolysis Osmolar Concentration Sea Urchins Tetrahymena Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Cell Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Medicine |
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