Cell complexity: nucular pores (Introduction)

by David Turell , Friday, December 12, 2014, 18:00 (3635 days ago) @ David Turell

These are for molecules entering and exiting the nucleus. It is a protective feedback mechanism. In biologic processes, there is always a control feedback molecular mechanism.-http://www.the-scientist.com//?articles.view/articleNo/41507/title/Nuclear-Pore-QA/-"The surveillance
 Conducting genetic assays in yeast, Lusk's group identified the ESCRT-III complex as responsible for monitoring nuclear pore assembly and clearing malformed complexes. ESCRTs are known to bend membranes and assist in endocytosis and cytokinesis, so it's not terribly surprising that they also patrol a process that impacts the double membrane of the nuclear envelope, says Lusk. These are also ancient machineries—present since the last common eukaryotic ancestor—and as such “have been repurposed throughout the cell,” he says.-"The dump
 If the surveillance process fails and defective complexes arise, the yeast cell's means of dealing with them is to lump them into a compartment of the nuclear envelope that Lusk's group dubbed the SINC, for storage of improperly assembled nuclear pore complexes. Locking them up ensures that daughter cells don't inherit subpar nuclear pores."-And we are still unravelling the complexity of how a cell works. The answer is to expect the known complexity to get worse, or better, however it is viewed. And, of course, Darwin's mutations did this with careful advanced planning.