Thank you all for the overwhelming responses. To answer your questions
The protein is monomer in solution. Complex formation significance score shown by PISA is "Zero" and suggested that the interface does not play any role in complex formation and seems to be a result of crystal packing only. The buried surface area is ~4% to that of solvent accessible surface area. As suggested by Bohdan and Loris, though the arrangement looks beautiful, the waters are just present at the dimer interface, stabilizing the dimer Thank you On Mon, 30 Sep 2019 at 15:54, Rudolph, Markus <markus.rudo...@roche.com> wrote: > Hello Vijaykumar, > > working in pharma structural biology, I see these pentamers all the time. > I suspect the reason for the stable structure of the five-membered ring is > that > the outer angle of a regular flat pentagon is 108 degrees, which is very > close to > the 104.5 degrees in water, so orientation of atoms for H-bonding is > near-perfect. > I have no statistics to back that up, though. > > Best regards, > > Markus > > _____________________________________ > > *Markus G. Rudolph* > Structural Biology > F. Hoffmann-La Roche Ltd. > pRED, Lead Discovery > Roche Innovation Center Basel > > Bldg./Room 65/312C > Grenzacherstrasse 124 > 4070 Basel > Switzerland > > Phone: +41 61 6886420 > > [image: Biophysical_Chemistry.jpg] > Link to CRC > > <https://www.crcpress.com/Biophysical-Chemistry/Klostermeier-Rudolph/p/book/9781482252231> > > On Fri, Sep 27, 2019 at 1:34 PM Vijaykumar Pillalamarri < > vijaypkuma...@gmail.com> wrote: > >> Dear Community, >> >> I solved the structure of a protein from vibrio. There are two >> molecules in the asymmetric unit of this protein. At the dimer interface, >> the C-termini of both the chains interact with each other with the help of >> five water molecules that form a pentagon. I have attached an image showing >> both the chains and stereo image of dimer interface in the inset. I was >> wondering if there is any significance to this or if there is any relevant >> literature that explains this behavior. >> >> Thank you >> Vijaykumar Pillalamarri >> C/O: Dr. Anthony Addlagatta >> Principal Scientist >> CSIR-IICT, Tarnaka >> Hyderabad, India-500007 >> Mobile: +918886922975 >> >> ------------------------------ >> >> To unsubscribe from the CCP4BB list, click the following link: >> https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB&A=1 >> > -- Vijaykumar Pillalamarri UGC-SRF C/O: Dr. Anthony Addlagatta Principal Scientist CSIR-IICT, Tarnaka Hyderabad, India-500007 Mobile: +918886922975 ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB&A=1
