RPC40 Antibody

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Description

Overview of Antibody Targeting Hypothetical RPC40

Antibodies targeting cell-surface receptors or intracellular proteins (e.g., CD40, CCR5) are designed to modulate immune responses or disrupt pathogenic mechanisms . If "RPC40" refers to a receptor or signaling complex, its antibody would likely:

  • Bind specifically to extracellular or intracellular epitopes to block or activate signaling pathways.

  • Modulate immune cell activity, such as T cells, B cells, or antigen-presenting cells (APCs), based on mechanisms observed in CD40-targeting antibodies .

  • Enhance antitumor or antiviral activity through direct cytotoxicity or immune conditioning .

Research Findings and Mechanistic Insights

Hypothetical data for an RPC40 antibody might align with results from analogous studies:

Preclinical and Clinical Effects

ParameterObserved Outcome (Hypothetical)Comparable Antibody Example
Target binding affinityHigh affinity (KD < 1 nM)Selicrelumab (anti-CD40)
Immune modulationT-cell enrichment in tumor microenvironmentChiLob7/4 (anti-CD40)
Safety profileTransaminase elevation at high dosesPRO 140 (anti-CCR5)
Therapeutic efficacyDisease stabilization in 50% of cases10E8/P140 bispecific antibody

Mechanistic Pathways

  • Direct cytotoxicity: Apoptosis induction in RPC40-expressing tumor cells .

  • Immune activation: Maturation of dendritic cells and reduction of immunosuppressive M2 macrophages .

  • Cytokine modulation: Elevation of pro-inflammatory cytokines (e.g., IL-12, MIP-1β) .

Clinical Trial Design Considerations

A phase I study for an RPC40 antibody might follow protocols similar to anti-CD40 trials :

Key Parameters

CohortDose Escalation RangePrimary EndpointsSecondary Endpoints
Safety0.5–240 mg/kgMaximum tolerated dose (MTD)Pharmacokinetics (PK)
Pharmacodynamics16–200 mg/kgB-cell depletion, T-cell activationCytokine release profile
Efficacy≥50 mg/kgObjective response rate (ORR)Progression-free survival (PFS)

Adverse Events

  • Grade 1–2: Infusion reactions (managed with corticosteroids) .

  • Grade 3–4: Hepatotoxicity (dose-limiting at MTD) .

Comparative Analysis with Existing Antibodies

If RPC40 shares functional parallels with CD40 or CCR5, its antibody could exhibit unique advantages:

FeatureRPC40 Antibody (Hypothetical)Selicrelumab (CD40) PRO 140 (CCR5)
TargetReceptor/ComplexCD40CCR5
MechanismAgonist/BlockadeAgonistAntagonist
Clinical PhasePreclinicalPhase IIPhase III
BreadthTumor/autoimmune focusPancreatic cancerHIV

Future Directions

  • Combination therapies: Pairing with checkpoint inhibitors (e.g., anti-PD-1) or chemotherapy .

  • Biomarker development: Correlating RPC40 expression levels with therapeutic response .

  • Bispecific formats: Engineering dual-targeting antibodies (e.g., RPC40/CD3) .

Product Specs

Buffer
Preservative: 0.03% Proclin 300
Composition: 50% Glycerol, 0.01M PBS, pH 7.4
Form
Liquid
Lead Time
Made-to-order (14-16 weeks)
Synonyms
RPC40 antibody; RPC5 antibody; YPR110C antibody; P8283.18 antibody; DNA-directed RNA polymerases I and III subunit RPAC1 antibody; RNA polymerases I and III subunit AC1 antibody; C37 antibody; DNA-directed RNA polymerases I and III 40 kDa polypeptide antibody; AC40 antibody; C40 antibody
Target Names
RPC40
Uniprot No.

Target Background

Function
DNA-dependent RNA polymerases catalyze the transcription of DNA into RNA utilizing four ribonucleoside triphosphates as substrates. RPC40 is a common component of RNA polymerases I (Pol I) and III (Pol III), which are responsible for synthesizing ribosomal RNA precursors and small RNAs (such as 5S rRNA and tRNAs), respectively. RPC40 is an integral part of the polymerase core and may act as a clamp element that dynamically opens and closes the cleft. It plays a crucial role in targeting retrotransposons Ty integration upstream of Pol III-transcribed genes (e.g., tRNA genes), enabling the proliferation of Ty1, Ty2, and Ty4 while minimizing genetic damage.
Database Links

KEGG: sce:YPR110C

STRING: 4932.YPR110C

Protein Families
Archaeal RpoD/eukaryotic RPB3 RNA polymerase subunit family
Subcellular Location
Nucleus, nucleolus.

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