Custom plasmid assembly of long multi-gene constructs


Custom Constructs

Build more, test more and make faster breakthroughs with our plasmid assembly services. Skip straight to expression ready, multi-gene plasmids up to 35kbp and with greater complexity than ever before.

From €0.12 /bp

Get straight to research with our plasmid assembly services

Skip the time and headache of manual assembly and get straight to research. Order multi-gene constructs up to 35kbp for even your most complex sequences. 

With typical turnaround in 25 days and greater than 91% project success, our plasmid assembly service is the fast, reliable way to increase your research output.

  • Assemblies of plasmids from 7.5 – 35kbp.
  • Fully custom assemblies.
  • >80% and <20% GC content. 
  • Complexity as standard.
  • from €0.12 /bp

You’re multi-gene constructs arrive comprehensively optimised for your application of choice.

We’ve spent two years training neural networks to solve assembly and optimisation problems with real world experiments. 

It means we can tackle even the toughest assembly challenges and provide a quality, optimised plasmid in under one month.

  • Troubleshooting as standard.
  • Scarless assembly.
  • Expression optimisation.
  • Design and parts support.

All Doulix multi-gene vectors are 100% sequenced verified with Sanger sequencing and produced to our rigorous laboratory procedures according ISO 9001:2008 standards.

  • 100% sanger sequence verified.
  • ISO 9001:2008 production standards.
  • Doulix quality promise or your money back.

Standard turnaround time (TAT) for our plasmid assembly services starts from 16 days. Of course, depending on complexity TAT may vary accordingly. Average turnaround is currently 25 days.

We’ll estimate delivery during checkout and keep you up to date in real-time.

With a greater than 90% on time delivery in 2020, your construct will arrive when say so. Meaning you can be ready to start research the moment your samples arrive.

  • Avg. turnaround 25 days 
  • Real-time project updates and one-to-one support.
  • Lyophilized DNA options in a range of prep sizes (1 ug, 10 ug, 50 ug, 5 mg)
  • E. coli stab agar and glycerol stock delivery options.
  • Add ons available for one stop shopping
  • Customs and shipping handling included.

think bigger with our plasmid assembly services


GC content

Complexity made simple.

With Doulix plasmid assembly service you can begin your most ambitious research projects yet. 

For most vendors, complex sequences such as secondary structure, repeats, high GC content or polypurine/polypyrimidine runs are impossible.

Not with Doulix, our sophisticated assembly methods and proprietary tech means we can tackle even the most complex projects


Sanger Sequence Verified

Quality as standard.

All multi-gene plasmids are rigorously quality controlled. Every plasmid is 100% sanger sequence verified meaning you certain of the quality your sample.


delivery in Q4 2020

Leading success.

Build more without the limits of DIY assemblies and unreliable outsourcing. With a greater than 91% success rate in Q4 of 2020 (we’ve made some updates) you can finally do those experiments you thought impossible.

Cloned Fragments

dsDNA Fragments


Cutting-edge synthesis services and world class support at prices to help you scale research with DNA.


Pre-purchase your DNA and save with the Doulix X-card while simplifying ordering for your whole lab.

Instant Quote

Get an instant quote on your next project in under a minute. Check prices, turnaround and add-on services in a few clicks.


We’ve partnered with top service providers to bring you everything you need to work effectively in one place.

The Human Touch

Have a particularly tricky project in mind, want to discuss strategy or find the ideal part for your project?

Speak to our experts to learn how we can help make your next project a success.

Doulix plasmid assembly support expert

Shorter development and faster discovery with DNA from Doulix.

See what your lab can do when you when you trust your DNA to us. Put us to the test with our Quality Promise: a 100% functional product or your money back.

So yeah sure, you can keep thinking those experiments are impossible. Or you can challenge us with your toughest requests for none of the risk.