2.   c.8.7         RraA-like  structural similarity and possible distant homology to the phosphohistidine domain of pyruvate phosphate dikinase !   
                   The "swivelling" beta/beta/alpha domain 3 layers: b/b/a; the central sheet is parallel, and the other one is antiparallel; there are some variations in topology ! this domain is thought to be mobile in most multi-domain proteins known to contain it
                   1nxj  d1nxjb_  B:26-31,91-97,101-109,109-116,152-157
                   1nxj  d1nxjc_  C:26-31,91-97,101-109,109-116,152-157
                   1nxj  d1nxja_  A:26-31,91-97,101-109,109-116,152-157
                   1q5x  d1q5xa_  A:23-28,88-93,98-105,106-113,149-155
                   1j3l  d1j3ld_  D:22-27,87-93,97-105,105-112,148-154
                   1j3l  d1j3lc_  C:22-27,87-93,97-105,105-112,148-154
                   1j3l  d1j3la_  A:22-27,87-93,97-105,105-112,148-154
                   1j3l  d1j3lb_  B:22-27,87-93,97-105,105-112,148-154
                   1vi4  d1vi4a_  A:24-29,89-94,99-106,107-114,150-156