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DUF192 domain-containing protein
Two structures have been solved for members of this large (>500 members) family of bacterial proteins present mostly in environmental bacteria and metagenomes (distant homologues are also present in several Plasmodium species). TOPSAN analysis for pdb:3pjy shows that there is much similarity with the other solved structure, pdb:3m7a, solved for UniProt:Q2GA55 (Saro_0823), a homologue of Thermotoga maritima TM1668, UniProt:Q9X1Z6., The homologue in Caulobacter crescentus (CC1388), UniProt:Q9A8G6, is associated with CspD, a cold shock protein (CC1387), UniProt:Q9A8G7. However, the genomic context of UniProt:Q2GA55 is most conserved with a putative xylose isomerase, suggesting a possible role in extracellular sugar processing. Saro_0821, UniProt:Q2GA57, is annotated as an AMP-dependent synthetase and ligase. PDB:3m7a structure corresponds to the C-terminal (27-165) fragment of the YP_496102 (Saro_0823) protein and it is structurally unique, as the best hits from Dali have a Z-score of 3.8 (1nt0, 2j1t, 3kq4) and it is thus a likely candidate for a new fold. Interestingly, many of the top Dali hits are involved in sugar metabolism. There are no obvious active site-like cavities on the protein surface of 3m7a (http://www.topsan.org/Proteins/JCSG/). (from Pfam)
DUF192 domain-containing protein similar to Methanocaldococcus jannaschii UPF0127 protein MJ1496
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