WELCOME TO KACTUS

Your centralized source for quality recombinant proteins and enzymes.

Browse our 3000+ catalog products:

Comprehensive catalog where versatility meets quality.

catalog products

3000+ Catalog Products

Over 3000 recombinant proteins carefully selected based on quality and research needs.

Tailored Expression Systems

Proteins tested in 8-16 various expression conditions to determine the optimal settings.

High Purity & Bioactivity

Rigorous quality control testing for purity and bioactivity using HPLC, SPR, ELISA, etc.

Next-Day Shipping from Boston, MA

Catalog products shipped next-day from our inventory center in Boston, MA.

Browse Products By Application

Target Antigens for Drug Discovery

High activity target antigens for drug discovery campaigns.
Target Antigens

MHC Tetramers & Monomers

Bioactive peptide-MHC complexes and peptide-ready MHCs.
MHC Tetramers

Gene Editing Products

GMP-Grade gene editing enzymes and AAV Titration ELISA Kits.
Gene Editing

Cell Therapy Products

CAR-T Targets, Laminin 521, Cytokines, & more.
Cell Therapy

RNA Enzymes

Full portfolio of GMP-grade mRNA enzymes.
RNA Synthesis

Featured Collections

VLPs & Nanodiscs

Choose from our two robust transmembrane protein expression platforms—Virus-Like Particles (VLPs) and Nanodiscs—offering full-length transmembrane proteins in their native conformation.

VLPs & Nanodiscs

MHC Monomers & Tetramers

Explore our comprehensive catalog of MHC class I and class II monomers and tetramers with mammalian-expression and verified bioactivity.

MHC Monomers & Tetramers

Peptide-ready MHCs

Load your own antigen in-house onto MHC monomer or tetramer.

Trending Products

AAV Titration ELISA Kits

Quantification of AAV capsids for serotypes 2, 5, 6, 8, or 9 with high specificity to individual AAV serotypes, high sensitivity, and a broad linear range.
AAV Titration ELISA Kits

AccuBase™, Base Editor

GMP-Grade
Precise DNA cytosine base editor with minimal off-target effects, creating C->T mutations for gene knockout without DNA breaks.
AccuBase™

CD19 Antigens

Mammalian-expressed human CD19 proteins with high monomer rates. Various spcies and fluorescent options. In-stock catalog products.
CD19 Proteins

Find us at our upcoming events!

Festival of Biologics Basel

October 15-17, 2024

Basel, Switzerland

Booth #832

ESGCT 2024

October 22-24

Rome, Italy

Booth #D40

PEGS Europe

November 5-7, 2024

Barcelona, Spain

Booth #1518

News & Articles

VLP Antibody Discover
Rethinking Refolding: The Case for Mammalian-Expressed Single-Chain Trimer MHCs
Virus-Like Particles (VLPs): Understanding their Structure, Expression, and Role in Immune Response