Isolation of SIP, a protein that interacts with SPB, a possible transcriptional regulatory factor in Rhodobacter sphaeroides.

Abstract

SPB is a transcriptional factor in Rhodobacter sphaeroides that represses expression of the puf operon under aerobic or semi-aerobic light conditions. Here, we identified a 17,500 Da protein designated SIP (SPB interaction protein) that interacts with SPB, as determined by binding to an SPB-His(x6) fusion protein-Ni column. The SPB-SIP interaction in vivo… (More)

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