3.4.21.B30	A30T	substantial extent of proteolytic cleavage	653604	
3.4.21.B30	A31C	partial reduction in UV mutability	651629	
3.4.21.B30	A31C	UmuD’ mutant	718102	
3.4.21.B30	A7C/C24A/S60A	variant with maximal cross-linking	-, 755139	
3.4.21.B30	A83X	the site-directed mutation of UmuDAb at Ala83 abolishes cleavage activity	731823	
3.4.21.B30	A89C	reduced ability to for a heterodimer with UmuD'	651622	
3.4.21.B30	C24A	ability to participate in UV mutagenesis and RecA-mediated cleavage are similar to that of the wild-type enzyme	651622	
3.4.21.B30	C24A	site-directed mutagenesis, that removes the cleavage site Cys residue of UmuD, the mutation does not substantially affect UmuD function, cleavage site variant	-, 731345	
3.4.21.B30	C24Y	poor extent of proteolytic cleavage	653604	
3.4.21.B30	C25D	site-directed mutagenesis, that removes the cleavage site Cys residue of UmuD, the mutation does not substantially affect UmuD function, cleavage site variant. For cleavage to occur, UmuD UmuD G25D dimer must first exchange in the presence of RecA:ssDNA, and any cleavage detected results from cleavage in trans. Cleavage is less efficient in this context, indicating that the decreased rate of cleavage in the trans dimers results from the time required for dimer exchange to first take place before cleavage can occur	-, 731345