Here is another example of a tetramer with neither 222 or 4 fold symmetry: http://www.ncbi.nlm.nih.gov/pubmed/7792597
Thierry -----Original Message----- From: CCP4 bulletin board [mailto:ccp...@jiscmail.ac.uk] On Behalf Of Vellieux Frederic Sent: Thursday, July 29, 2010 03:35 AM To: CCP4BB@JISCMAIL.AC.UK Subject: Re: [ccp4bb] non-symmetric tetramer ? Non-symmetric tetramers: you can check out Tete-Favier et al (1993), Acta Cryst. D49, 246: the quaternary structure was assumed to have local 222 symmetry. It turned out this was not exactly the case: the actual symmetry of the object (the molecule) was "pseudo" 2t2t2t. So in addition to 2-fold axes being common as an assembly mechanism (leading to the quite common 222 symmetry) you can have deviations from this symmetry. Fred. Fred wrote: > Dear CCP4bb, > Could someone please, point me to some references about non-symmetric > tetramers? If I have a tetramer composed by 4 identical subunits, > it'll always have a P4 point group symmetry? > Thank in advance, > Tomb > > ********************************************************************* This message and any attachments are solely for the intended recipient. If you are not the intended recipient, disclosure, copying, use or distribution of the information included in this message is prohibited -- Please immediately and permanently delete.
