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Figure 5.
Figure 5: Electrostatic surface potential models of HutP and the
proposed mechanism for the anti-terminator complex formation.
a -d, Molecular surfaces of the HutP dimer of uncomplexed HutP
(a), HutP -HBN (b), the HutP -l-histidine -Mg2+ complex (c) and
the quaternary HutP complex (d), coloured in accordance with the
electrostatic potential. HBN, l-histidine and RNA are
represented by ball-and-stick models. Mg2+ ions are represented
by a cpk model. e, A schematic model proposed for HutP
anti-terminator complex formation. f, A proposed model for the
existence of two potential binding sites (highlighted in blue
boxes) within the terminator region. The GC-rich region is
highlighted in the red box. The RNA-binding residues are
indicated by magenta and green.
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