LexA repressor (Mr 22,700) inhibits transcription of all the SOS genes, and induction of the SOS response requires removal of LexA

TLS Online TPP Program

#Id: 1366

#Unit 4. Cell Communication and Cell Signaling

Phosphotyrosines function as docking sites for STAT proteins.

TLS Online TPP Program

#Id: 2462

#Unit 13. Methods in Biology

A. G. Tiselius (1937) Performed Moving boundary electrophoresis  in a U-shaped tube using Schlieren optics on both end for Measurements of the electrophoretic mobilities.

TLS Online TPP Program

#Id: 975

#Unit 5. Developmental Biology

Noggin binds to BMP4 and BMP2 and inhibits their binding to receptors

TLS Online TPP Program

#Id: 6495

#Unit 3. Fundamental Processes

TFIIB, TFIIE, and TFIIH are required to melt DNA to allow polymerase movement. The last factors to join the initiation complex are TFIIE and TFIIH. 

TLS Online TPP Program

#Id: 6299

#Unit 3. Fundamental Processes

In the case of the bacterial enzyme bearing s70, this transition, often called isomerization, does not require energy derived from ATP hydrolysis and is instead the result of a spontaneous conformational change in the DNA– enzyme complex to a more energetically favorable form.