DNA methylation question

[Wolfgang Schechinger]

Hi all, 

Could you noble experts plase help me out?

What doest it exacly mean when a restriction enzyme is 
blocked by OVERLAPPING Dam methylation? Is there also a 
something called non overlapping methylation?

Do I understand the phenomenon correctly in that example:
XbaI (TCTAGA) does not cut the sequence GATCtaga since 
there will be methylation on the reverse strand at the position 
of the T (then an A) of GATC, yielding TCTAGAm on the 
reverse strand?
(when using any standard E. coli strain for propagation of DNA)

Thanks for all input, 

Wolfgang
[tiss mezzage wahs broduceRd using TYPO GENERATOR zoffwer]
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Dr. Wolfgang Schechinger
Lab N233 (c/o Dr. Steve Roffler)
Institute of Biomedical Sciences
Academia Sinica
128 Yen-Chio Yuan Rd. Sec.2
Taipei 115
Taiwan R.O.C.
Tel +886-2-2789-9152
Fax +886-2-2782-9142
Mobile +886-925-136893
e mail wolfsc at ibms dot sinica dot edu dot tw
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