Consensus terms for the HTH_XRE domain 

AB49550|CAB495   RLR-EFREKY---------------------GL-TQ-----------EELARIL-GVTR-
CONSENSUS/80%    .lp.th+tt......................th.s............tphuthh.shs..
CONSENSUS/65%    pl+.phRppt.....................sl.ot...........pclActh.ulst.
CONSENSUS/50%    cL+.chRcpp.....................Gl.op...........c-LAcpl.Glop.


AB49550|CAB495   ------QTIIAIEKGKYD-------PSLRLA-FKIARF---FGVRIEDI
CONSENSUS/80%    ......thltthtpst..........s.t.h..tltph...htht.t.h
CONSENSUS/65%    ......stlsphEpGptp.......sshphl.hplsph...hshshp.h
CONSENSUS/50%    ......ssluclEsGcps.......Pohcsl.p+lAcs...Lslslspl

The grouping of amino acids to classes and class abbreviation (the key) used within consensus sequences are shown below:

ClassKeyResidues
alcoholoS,T
aliphaticlI,L,V
any.A,C,D,E,F,G,H,I,K,L,M,N,P,Q,R,S,T,V,W,Y
aromaticaF,H,W,Y
chargedcD,E,H,K,R
hydrophobichA,C,F,G,H,I,K,L,M,R,T,V,W,Y
negative-D,E
polarpC,D,E,H,K,N,Q,R,S,T
positive+H,K,R
smallsA,C,D,G,N,P,S,T,V
tinyuA,G,S
turnliketA,C,D,E,G,H,K,N,Q,R,S,T