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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Block, S. M. Mitra, P. P. Svoboda, K. |
| Description | Author Affiliation: Svoboda K ( Rowland Institute for Science, Cambridge, MA 02142.); |
| Abstract | We studied fluctuations in the displacement of silica beads driven by single molecules of the motor protein kinesin, moving under low mechanical loads at saturating ATP concentrations. The variance in position was significantly smaller than expected for the case of stepwise movement along a regular lattice of positions with exponentially distributed intervals. The small variance suggests that two or more sequential processes with comparable reaction rates dominate the biochemical cycle. The low value is inconsistent with certain recently proposed thermal ratchet models for motor movement as well as with scenarios where the hydrolysis of a single ATP molecule leads to a cluster of several steps. Fluctuation analysis is a potential powerful tool for studying kinetic behavior whenever the output of a single enzyme can be monitored. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 25 |
| Volume Number | 91 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1994-01-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Kinesin Metabolism Animals Decapodiformes Chemistry Isolation & Purification Kinetics Mathematics Nervous System Enzymology Probability Time Factors Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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