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Fig. 1. (A) The CLUSTALX-analysis of the indicated amino acid sequences
demonstrates the two classes of Ubc6-related proteins. (B) Comparison of the
amino acid sequences of scUbc6p, mmUbc6p and hsUbc6ep. The CLUSTALW-alignment
displays the well-conserved N-terminal Ubc domain (marked by a dotted line)
and the less conserved tail region in both Ubc6 subfamilies. The conserved
active site cysteine is indicated by an asterisk and the region of the
membrane spanning domains is underlined.