Draw diagrams to illustrate the action of CBP as a coactivator of (a) phosphorylated CREB; (b) a

step 1 So we have problem number 11 chapter 7. Okay, according to the question, they're saying that usi

Draw diagrams to illustrate the action of CBP as a...

Key Concepts

Histone Acetyltransferase Activity

The histone acetyltransferase (HAT) activity of CBP modifies chromatin by acetylating histone tails. This acetylation reduces the affinity between histones and DNA, resulting in a more relaxed chromatin state that is accessible for transcriptional activation, thereby playing a critical role in gene regulation.

Transcriptional Coactivators

Transcriptional coactivators are proteins that do not bind directly to DNA but, through protein-protein interactions, facilitate the assembly and activation of the transcriptional machinery. They integrate signals from various transcription factors, modify chromatin structure, and enhance the transcription of target genes.

CBP (CREB-binding protein)

CBP is a versatile transcriptional coactivator that interacts with multiple transcription factors, including phosphorylated CREB and nuclear receptors. It plays a pivotal role in modulating gene expression by serving as a bridge between these factors and the basal transcription machinery, as well as by modifying chromatin through its intrinsic enzymatic activities.

Phosphorylated CREB

Phosphorylated CREB is the active form of the CREB transcription factor, modified via phosphorylation in response to external signals, such as cAMP. This posttranslational modification enables CREB to interact with coactivators like CBP, which in turn promotes the transcription of downstream target genes.

Nuclear Receptors

Nuclear receptors are a class of ligand-activated transcription factors that regulate gene expression in response to hormonal and other signaling molecules. When activated, these receptors recruit coactivators such as CBP to enhance transcription by facilitating the recruitment of the transcriptional machinery and modifying the chromatin landscape.

Transcript

00:01 So we have problem number 11 chapter 7.

00:04 Okay, according to the question, they're saying that using grab a nuclear receptor example, compare and contrast the structural changes that take place within when these transcription factors bind to their co -factors, right? so according to this diagram, you know, in the a part over here, right? cyclic camp responsive element binding protein which is creb right contains two glue rich domains which is q1 and q2 right a central kinase inducible domain which is kid and a carboxel terminal basic leo sipper which is b z i b so domain the the kid domain and q2 domains bind to tbp associated factors 4 which is taf right and you know phosphorylation of the kid domain at scr one double three promotes an interaction with a crab binding protein cbp right so you know and it's parallel p333333 300 s1 -3 -3 is phosphorylated by a number of basic, you know, directed kinases including protein, kinase, a, p -k -a, and p -k -c, you know, two clusters of phosphorylation sites, flanking, s -e -r -1 -3 -3, and, you know, inhibits cbb -p -300 binding.

01:58 So these sites are phosphorylated by ataxia, deline, zytasia, you know, mutated atm and, you know, how we can say, and, you know, calcium and chalmodeum dependent, kinase 2, which is kmkwi, is as indicated.

02:20 So bzip, you know, domain promotes crept dna binding, you know, we can say to camp, regulatory, transcriptional cofactors, which is crtcs, right? so, you know, arg -314 in the bz domain is critical for the krebs -crtc interaction.

02:48 So in the b part, you know, domain structure of cbp -300, you know, showing the nuclear receptor detection domain rid, right, and cis and his rich region, which is ch1 and ch3, right? you know, over here, right? so, crab binding k -i -x domain, you know, bromode domain, b, which is pr, and then plant homo domain, which is ph .t, histone, acetyl transferase, which is hat...

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