The major candidate for the factor that forms the Nieuwkoop center was β-catenin (This multifunctional protein also proved to be a key player in the formation of the dorsal amphibian tissues)

TLS Online TPP Program

#Id: 6391

#Unit 2. Cellular Organization

CAP–cAMP binds upstream to promoters DNA and target bends the DNA considerably about 100 degrees

TLS Online TPP Program

#Id: 6392

#Unit 2. Cellular Organization

Stimulation of b-galactosidase synthesis by cAMP with wild-type and mutant CAP.

TLS Online TPP Program

#Id: 6393

#Unit 2. Cellular Organization

The E. coli trp operon contains the 5 genes Trp-EDCBA for the anabolic enzymes to make the tryptophan.

TLS Online TPP Program

#Id: 6394

#Unit 2. Cellular Organization

Major enzyme is Tryptophan Synthase

TLS Online TPP Program

#Id: 6395

#Unit 2. Cellular Organization

Major enzyme is Tryptophan Synthase whose activity is reduced when trp concentration is high

TLS Online TPP Program

#Id: 6396

#Unit 2. Cellular Organization

Trp operon is negatively regulated by two ways

 Repression

Attenuation