. 2006 Jul 4;34(11):3317–3325. doi: 10.1093/nar/gkl412

Table 2.

Definition of the AIRs for the three repressor/operator systems

	Protein	DNA	Reference
Cro – O₁R
Active	K27^a,Q29^a,S30^a,L33^a,b	T3^c,A4^a,c,C5^a,A6^a,G30^cT31^a,b,c,T32^a,b,c,T33^a,G34^a,T35^a	(50–53)
Passive	R10,K40,R41,P42	—
Lac – O1
Active	T5^a,b,S16^a,Y17^b,Q18^b,R22^b,V30^b	T4^c,G5^a,c,T6^a,G7^a,A8^a,C14^c, T15^a,c,C16^a,A17^a,C18^a	(54–57)
Passive	H29,S31	—
Arc – operon
Active	F10^a,R13^a,S32^a	T1^c,A2^c,T3^c,G5^c,T6^a,A7^a,G8^a,A9^a,A14^c,C15^c,T16^c,C17^a,T18^a,A19^a	(58)
passive	Q9,N11,R16,D20,R23	—

The Arc monomer is composed of two symmetric subunits and only the restraints for one subunit are shown.

^aConserved residues derived from the database of homology-derived secondary structure of proteins (HSSP).

^bMutagenesis data.

^cEthylation interference.