D-Ribose-5-Phosphate Isomerase B from Escherichia Coli is Also a Functional D-Allose-6-Phosphate Isomerase, While the Mycobacterium Tuberculosis Enzyme is not.
Roos, A.K., Mariano, S., Kowalinski, E., Salmon, L., Mowbray, S.L.(2008) J Mol Biol 382: 667
- PubMed: 18640127 
- DOI: 10.1016/j.jmb.2008.06.090
- Primary Citation of Related Structures:  
2VVO, 2VVP, 2VVQ, 2VVR - PubMed Abstract: 
Interconversion of D-ribose-5-phosphate (R5P) and D-ribulose-5-phosphate is an important step in the pentose phosphate pathway. Two unrelated enzymes with R5P isomerase activity were first identified in Escherichia coli, RpiA and RpiB. In this organism, the essential 5-carbon sugars were thought to be processed by RpiA, while the primary role of RpiB was suggested to instead be interconversion of the rare 6-carbon sugars D-allose-6-phosphate (All6P) and D-allulose-6-phosphate ...