VPS may refer to:
Class III PI 3-kinase is a subgroup of the enzyme family, phosphoinositide 3-kinase that share a common protein domain structure, substrate specificity and method of activation.
There is only one known class III PI 3-kinase, Vps34, which is also the only PI 3-kinase expressed in all eukaryotic cells. In humans it is encoded by the PIK3C3 gene. In human cells Vps34 associates with a regulatory subunit, p150.
Vps34 is more accurately described as a phosphatylinositol 3-kinase. In vivo Vps34 can phosphorylate only Phosphatidylinositol to form phosphatidylinositol (3)-phosphate (PtdIns(3)P).
Vps34 was first identified in a Saccharomyces cerevisiae (budding yeast) screen for proteins involved vesicle-mediated vacuolar protein sorting (hence Vps). A number of proteins containing a phosphoinositide binding domain specific for PtdIns(3)P that function in cellular protein trafficking have been identified.
Vps34 has been shown to interact with Vps15, a protein kinase. Vps15 can activate the lipid kinase activity of Vps34 and interact with Rab5, which has been hypothesized to recruit the Vps34/15 complex to early endosomes. Vps15 has a myristoylation tag that associates the complex with the membrane. The Vps34/15 complex also can interact with Rab7. Together, the complex can function at early to late endosomes.
VPS29 is a human gene coding for the vacuolar protein sorting protein Vps29, a component of the retromer complex.
The homologous protein (one that performs the same function) in yeast is Vacuolar protein sorting 29 homolog (S. cerevisiae).
VPS29 belongs to a group of genes coding for vacuolar protein sorting (VPS) proteins that, when functionally impaired, disrupt the efficient delivery of vacuolar hydrolases. The protein encoded by this gene, Vps29, is a component of a large multimeric complex, termed the retromer complex, which is involved in retrograde transport of proteins from endosomes to the trans-Golgi network. Vps29 may be involved in the formation of the inner shell of the retromer coat for retrograde vesicles leaving the prevacuolar compartment.Alternative splice variants encoding different isoforms, and usage of multiple polyadenylation sites have been found for this gene.
I've been away a year and a day
You recognize love after the fact
You did what you did and that was that
Don't say words that you don't mean
When I'm gone, please speak well of me
Looking back now
I only wish I had been kinder
Did I ever know love, did I ever know love?
And could I have been blinder?
Don't hold back all your love for someday, for someday
I would say that I'm sorry if it would do any good
But to never regret means you have to forget