Abstract
Cell-free systems provide essential tools for elucidating the molecular mechanisms underlying complex cellular processes such as vesicular transport. The biochemical utility o f these model systems is strengthened by assays that allow rapid, quantitative detection o f the events being studied. Two model systems have recently been developed to reconstitute coated-vesicle budding, and two different biochemical assays are used to detect this event. Striking differences in the biochemical requirements for ‘coated-vesicle budding’ are detected by these two assays, suggesting that two distinct events are being measured. These findings have wide implications for the use of cell-free assay systems in cell biology.
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