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Table 1 Summary of effects on PsOep23 channel activity by the added compounds

From: Oep23 forms an ion channel in the chloroplast outer envelope

   

Change of

Compound

Charge at pH 7

Conc. [mM]

Channel conductance

P open

+100 mV

−100 mV

 

Malic acid

−2

20

-

-

-

Oxaloacetic acid

−2

2.5

-

-

-

Adenine

0

3-5

-

-

-

Thymine

+1

3-5

-

-

-

Ornithine

+1

2-10

-

-

-

Caderverine

+2

5-10

-

-

-

Spermidine

+3

5

−25%

−12%

-

  

10

−36%

−21%

-

Spermine

+4

5

−28%

-

Yes

  

10

−51%

−22%

Yes

  1. Only spermidine and spermine at 5-10 mM induced a substantial reduction of single channel conductance while spermine alone also reduced the open probability. The bulk conductivity and pH were changed by max. 3% or 0.2 units, respectively (exception: thymine and adenine at 5 mM +0.7 pH units).
  2. - : less than 10% charge.
  3. Popen: open probability.
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BMC Plant Biology

ISSN: 1471-2229

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