Figure 4

Molecular surface for one monomer of the alanine racemases from B. anthracis (A) and S. lavendulae (B) docked into the ribbon diagram of the opposite monomer. Alr _Bax has extended intermonomer contacts at its C- and N-termini that are not present for other alanine racemases like the one from S. lavendulae. Position of residues taking part in intermonomer contacts are shown in purple and yellow for Alr _Bax and green and red for Alr _Sla . For Alr _Bax , residues on Helices 4 and 5 and on N- and C- termini that make intermonomer polar contacts are shown as sticks. Equivalent residues taking part in intermonomer contacts are also shown as sticks for Alr _Sla . Positions for the N- and C- termini, Helix 4 and Helix 5 are indicated by arrows.