HIV_1 reverse transcriptase recombinant antigen.
- Known as:
- HIV_1 reverse transcriptase Rec. antigenic.
- Catalog number:
- 00198-V
- Product Quantity:
- 100 µg
- Category:
- -
- Supplier:
- Virogen
- Gene target:
- HIV_1 reverse transcriptase recombinant antigen.
Related products to: HIV_1 reverse transcriptase recombinant antigen.
Related articles to: HIV_1 reverse transcriptase recombinant antigen.
- Isoginkgetin (ISO) is a natural flavonoid with potential anticancer effects. However, the anticancer mechanisms of ISO in gastric cancer remain insufficiently explored. - Source: PubMed
Li LinenZhu HuilingCao KunChen Hao - The P-TEFb transcriptional kinase complex regulates the pause release checkpoint step in transcription by RNA polymerase II (RNAPII). We sought to identify hypoxia-specific interactions that could direct P-TEFb activity to hypoxia-responsive genes. Using a biochemical purification approach, we discovered a hypoxia-specific, chromatin-associated interaction between the P-TEFb subunit cyclin T1 (CCNT1), nuclear localized mitochondrial chaperone Tim8-Tim13 complexes, and the hypoxia-inducible, DNA binding transcription factor BHLHE40. This interaction is confirmed across multiple human cell lines. Tim8-Tim13 complex disruption and BHLHE40 silencing both impair the transcriptional response to acute hypoxia. HIF is not involved in the CCNT1/BHLHE40/Tim8-Tim13 interaction, and neither genetic HIF-1β knockout nor pharmacological HIF-2α inhibition (belzutifan) eliminates BHLHE40 expression. Finally, BHLHE40 depletion compromises the proliferation of 786-O clear cell renal carcinoma cells, which constitutively express HIF-2α and hypoxia-responsive genes. Together, these findings reveal a partially HIF-independent regulatory axis, in which Tim8-Tim13 complexes and BHLHE40 modulate P-TEFb activity in the transcriptional response to hypoxia. - Source: PubMed
Publication date: 2026/05/20
Soliman Shimaa Hassan AbdelAzizDe Fabritiis SimoneIwanaszko MartaLin Lawrence AustinDas MadhurimaGold SarahAndersen Grant DavidChakrabarty Ram PChandel Navdeep SShilatifard Ali - Hexim proteins are key RNA-dependent regulators of eukaryotic transcription through 7SK-dependent sequestration and inactivation of the kinase P-TEFb (Cdk9-CyclinT1/2) in the 7SK RNP. P-TEFb activity drives release of RNA polymerase II from promoter-proximal pausing for eukaryotic and HIV-1 transcription. The molecular mechanism by which 7SK binding overcomes an intrinsic Hexim autoinhibition for subsequent P-TEFb inactivation has remained unresolved. Here, using NMR and biophysical methods we demonstrate that Hexim1 homodimer engages two high-affinity sites on 7SK RNA. This dual-site binding triggers a conformational rearrangement in Hexim1's disordered central region that unmasks the Cdk9-binding site, which is otherwise sequestered within an inter-monomer dimer interface. These findings reveal how Hexim autoinhibition dictates its specificity for 7SK RNA and prevents premature P-TEFb inhibition in the absence of 7SK, thereby providing a mechanistic understanding of Hexim/P-TEFb assembly into the 7SK RNP and further considerations for understanding Hexim-Tat competition during viral transcription. - Source: PubMed
Publication date: 2026/01/15
Yang YuanMurrali Maria GraziaGalvan SabrinaWang YaqiangStephen ChristineAjjampore NehaWang XiaoyuFeigon Juli - Activated immune cells are highly susceptible to human immunodeficiency virus (HIV) infection. Vitamin D (VitD) induces antimicrobial responses and reduces cellular activation. We investigated VitD effects on HIV-1 replication, glucose uptake, and gene regulation using computational and in vitro approaches. CD4 T cells from healthy male donors were treated with VitD and infected with HIV-1. After 72 h, p24 protein was measured to assess viral replication. VitD effects on anti- and pro-HIV genes were analyzed by a Boolean network model based on curated databases and the literature. CCR5 and CXCR4 coreceptor expression, AKT phosphorylation, and glucose uptake were evaluated by flow cytometry, and expression of some model-identified genes was quantified by qPCR. VitD reduced p24 by 53.2% ( = 0.0078). Boolean network modeling predicted that VitD upregulates antiviral, migration, and cell-differentiation related genes, while downregulating genes related to cellular activation, proliferation, glucose metabolism, and HIV replication, notably and . In vitro, VitD reduced AKT phosphorylation by 26.6% ( = 0.0156), transcription of by 22.7% ( = 0.0391), and glucose uptake by 22.8% ( = 0.0039) without affecting classic antiviral genes or coreceptor expression. These findings suggest an anti-HIV effect of VitD, mediated through AKT and glucose metabolism downmodulation, both involved in cell activation and HIV-1 replication. - Source: PubMed
Publication date: 2025/03/18
Loaiza John DGómez Jose FernandoMuñoz-Escudero DanielGonzalez Sandra MEubank Timothy KyleRugeles Maria TRodríguez-Perea Ana LucíaAguilar-Jimenez Wbeimar - Cyclin-dependent kinase 9 (CDK9) plays a pivotal role in promoting oncogenic transcriptional pathways, significantly contributing to the development and progression of cancer. Given the unique biostability of d-amino acid, the development of d-amino acid-containing peptides (DAACPs) is a promising strategy for cancer treatment. Currently, no DAACPs inhibitor targeting CDK9-cyclin T1 have been reported. Here, we reported the identification of a novel, highly potent, selective and stable DAACPs inhibitor (peptide-5) targeting CDK9-cyclin T1 interaction. Peptide-5 showed nanomolar inhibitory effect against CDK9-cyclin T1 (IC = 4.16 ± 0.11 nM). Molecular dynamics (MD) simulation exhibited that peptide-5 stably bound to CDK9. Peptide-5 showed good inhibitory activity against multiple types of prostate cancer cells and demonstrated good biostability in mouse serum. Moreover, peptide-5 suppresses the tumor growth in DU145 cell-derived xenografts nude mice. These data suggest that peptide-5 is a potent antitumor candidate for further research. - Source: PubMed
Publication date: 2025/01/06
Xu ZhenGeng YifeiGuan LixiaNiu Miao-MiaoXu CenYang LiLiang Sudong