Puzzle 432 de novo freestyle 8
3SD2 Crystal structure of a Putative member of DUF3244 protein family (BT_3571) from Bacteroides thetaiotaomicron VPI-5482 at 1.40 A resolution Joint Center for Structural Genomics
Rav3n_pl : beta barrel ?
see here beta barrel in wikipedia to see what he means.
seem close to this protein http://www2.rcsb.org/pdb/explore/explore.do?structureId=3SD2