1. Fox BG, Shanklin J, Somerville C, and Munck E. Proc. Natl. Acad Sci. USA 1993;90:2486
2. Kok M, Oldenhuis R, van der Linden RPG, Ratjees P, Kingma J, van Lelyveld P, Widholt B. J. Biol. Chem. 1989; 264:5435
3. Stukey JE, McDonough VM, Martin CM. J. Biol Chem. 1989;265:16537
4. This work was supported by the Office of Basic Energy Research of the U.S. Department of Energy (J.S. and E.J.W).