Periplasmic space enzyme marker

[Michael Benedik]

Can anyone suggest an enzyme with an easy to assay activity which can
be used as a marker for the periplasm of E. coli OTHER than alkaline
phophatase, beta lactamase or ribonuclease??? We need to assay for
leakage from the periplasm and for technical reasons can not use any
of these standard enzyme markers. 

Many thanks.
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	 Michael Benedik
	 Department of Biochemical and Biophysical Sciences
	 University of Houston
	 INTERNET: Benedik at UH.EDU	BITNET: Benedik at UHOU