[Cell-biology] Re: Cytoplasmic marker enzyme (Plant)

[Satoru Uzawa]

Did anybody respond to your query??

I just wanted to hear how you would think about argininosuccinate lyase as a 
marker for cytoplasm in plants.  You can assay argininosuccinate lyase 
spectrometrically, too (no simple, though).  In contrast, ornithine 
carbamoyltransferase may be used as a plastid marker which has an easy 
spectrometric assay.

Just few thoughts.

Good luck!

Satoru Uzawa

Jana Hakenjos <jana.hakenjos At biologie.uni-freiburg.de> wrote:
> Dear all,
> 
> I am isolating chloroplasts from Physcomitrella patens (a moss) via a
> Percoll density gradient. To test for contaminations from other
> compartments I want to measure enzyme activities. But I can't find a
> good candidate for the cytoplasm that fulfils following "requirements":
> 
> - no isoenzyme(s) in plastids!!!!!
> - easy to measure- most preferable spectrometric
> - no radioactive assay
> 
> My first try was alcohol dehydrogenase but I couldn't detect any
> activity- most likely it isn't expressed under my conditions.
> 
> I am thankful for every hint!
> 
> Thank you very much in advance,
> 
> Jana Hakenjos