obsolete D-ribose 5-phosphate:D-sedoheptulose 7-phosphate transaldolase activity (obsolete GO:0102647)
OBSOLETE. Catalysis of the reaction: sedoheptulose 7-phosphate + D-ribose 5-phosphate = D-glycero-D-altro-octulose 8-phosphate + D-erythrose 4-phosphate.