Catalase quaternary structure

The diversity among catalases, evident in the variety of subunit sizes, the number of quaternary structures, the different heme prosthetic groups, and the variety of sequence groups, enables them to be organized in four main groups the classic monofunctional enzymes (type A), the catalase-peroxidases (type B), the nonheme catalases (type C), and miscellaneous proteins with minor catalatic activities (type D). 

Bergdoll et al. 87) have proposed that some proteins, including catalase, exhibit arm exchange or an interaction of one subunit with an adjacent subimit to stabilize quaternary structure, and that this... 

Fig.lA(Left). HPLC (gel filtration) elution profiles of PPDK. The concentration of magnesium included in the incubation mixture and equilibration and elution buffer for the column is shown in each profile. The number above each peak show the elution time. The elution times for PEP carboxylase (Mr. 400,000), catalase (Mr. 240,000) and aldolase(Mr. 158,000) were 12.3 min, 14.9 min and 15.6 min respectively. Fig.lB(Right). Effect of MgCl2 on the quaternary structure of PPDK. 

---