Kinetic analysis of Cas12a and Cas13a RNA-Guided nucleases for development of improved CRISPR-Based diagnostics
- Global Health Labs, Bellevue, WA (United States); Intellectual Ventures Global Good Fund, Bellevue, WA (United States)
- Global Health Labs, Bellevue, WA (United States)
- Université d'Angers, Angers (France)
- Univ. of California, Berkeley, CA (United States); Monash Univ., Melbourne, VIC (Australia)
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Gladstone Institutes, San Francisco, CA (United States)
Bacterial CRISPR systems provide acquired immunity against invading nucleic acids by activating RNA-programmable RNases and DNases. Cas13a and Cas12a enzymes bound to CRISPR RNA (crRNA) recognize specific nucleic acid targets, initiating cleavage of the targets as well as non-target (trans) nucleic acids. Here, we examine the kinetics of single-turnover target and multi-turnover trans-nuclease activities of both enzymes. High-turnover, non-specific Cas13a trans-RNase activity is coupled to rapid binding of target RNA. By contrast, low-turnover Cas12a trans-nuclease activity is coupled to relatively slow cleavage of target DNA, selective for DNA over RNA, indifferent to base identity, and preferential for single-stranded substrates. Combining multiple crRNA increases detection sensitivity of targets, an approach we use to quantify pathogen DNA in samples from patients suspected of Buruli ulcer disease. Results reveal that these enzymes are kinetically adapted to play distinct roles in bacterial adaptive immunity and show how kinetic analysis can be applied to CRISPR-based diagnostics.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- National Institutes of Health (NIH); National Science Foundation (NSF); USDOE
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 2470743
- Journal Information:
- iScience, Journal Name: iScience Journal Issue: 9 Vol. 24; ISSN 2589-0042
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Guide-bound structures of an RNA-targeting A-cleaving CRISPR–Cas13a enzyme
Broad-spectrum enzymatic inhibition of CRISPR-Cas12a
Journal Article
·
Sun Sep 10 20:00:00 EDT 2017
· Nature Structural & Molecular Biology
·
OSTI ID:1426442
Broad-spectrum enzymatic inhibition of CRISPR-Cas12a
Journal Article
·
Sun Mar 31 20:00:00 EDT 2019
· Nature Structural & Molecular Biology
·
OSTI ID:1605236