Nonribosomal code: Difference between revisions

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The '''nonribosomal code''' refers to key amino acid residues and their positions within the primary sequence of an adenylation ___domain of a [[nonribosomal peptide synthetase]] used to predict substrate specificity and thus (partially) the final product. Analogous to the nonribosomal code is prediction of peptide composition by DNA/RNA codon reading, which is well supported by the [[central dogma of molecular biology]] and accomplished using the genetic code simply by following the [[DNA codon table]] or [[RNA codon table]]. However, prediction of natural product/secondary metabolites by the nonribosomal code is not as concrete as DNA/RNA codon-to-amino acid and much research is still needed to have a broad-use code. The increasing number of sequenced genomes and high-throughput prediction software has allowed for better elucidation of predicted substrate specificity and thus natural products/secondary metabolites. Enzyme characterization by, for example, ATP-pyrophosphate exchange assays for substrate specificity and ''in silico'' substrate-binding pocket modelling helps support predictive algorithms. Much research has been done on bacteria and fungi, with prokaryotic bacteria having easier-to-predict products.

{{more footnotes|date=May 2014}}

{{Technical|date=July 2022}}

The nonribosomal peptide synthetase (NRPS), a multi-modular enzyme complex, classically contains repeating, tri-domains (adenylation (A), peptidyl carrier protein (PCP) and lastly codensation(C)). The adenylation ___domain (A) is the focus for substrate specificity since it is the initiating and substrate recognition ___domain. The NRPS collinearity principle/rule dictates that given the order of adenylation domains (and substrate-specificity code) throughout the NRPS one can predict the amino acid sequence of the produced small peptide. NRPS, NRPS-like or NRPS-PKS complexes also exist and have ___domain variations, additions and/or exclusions.

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The '''nonribosomal code''' refers to key amino acid residues and their positions within the primary sequence of an adenylation ___domain of a [[nonribosomal peptide synthetase]] used to predict substrate specificity and thus (partially) the final product. Analogous to the nonribosomal code is prediction of peptide composition by DNA/RNA codon reading, which is well supported by the [[central dogma of molecular biology]] and accomplished using the genetic code simply by following the [[DNA codon table]] or [[RNA codon table]]. However, prediction of natural product/secondary metabolites by the nonribosomal code is not as concrete as DNA/RNA codon-to-amino acid and much research is still needed to have a broad-use code. The increasing number of sequenced genomes and high-throughput prediction software has allowed for better elucidation of predicted substrate specificity and thus natural products/secondary metabolites. Enzyme characterization by, for example, ATP-pyrophosphate exchange assays for substrate specificity and, ''[[in silico]]'' substrate-binding pocket modelling and structure-function mutagenesis (''in vitro'' tests or ''in silico'' modelling) helps support predictive algorithms. Much research has been done on bacteria and fungi, with prokaryotic bacteria having easier-to-predict products.

The nonribosomal peptide synthetase (NRPS), a multi-modular enzyme complex, classicallyminimally contains repeating, tri-domains (adenylation (A), peptidyl carrier protein (PCP) and lastly codensationcondensation(C)). The adenylation ___domain (A) is the focus for substrate specificity since it is the initiating and substrate recognition ___domain. In one example, adenylation substrate-binding pocket (defined by 10 residue within) alignments led to clusters giving rise to defined specificity (i.e. the residues of the enzyme pocket can predict nonribosomal peptide sequence).<ref>The nonribosomal code 1999 {{full|date=January 2022}}</ref> ''In silico'' mutations of substrate-determining residues also led to varying or relaxed specificity.<ref>The specificity-conferring code of adenylation domains in nonribosomal peptide synthetases 1999 {{full|date=January 2022}}</ref> Additionally, the NRPS collinearity principle/rule dictates that given the order of adenylation domains (and substrate-specificity code) throughout the NRPS one can predict the amino acid sequence of the produced small peptide. NRPS, NRPS-like or NRPS-PKS complexes also exist and have ___domain variations, additions and/or exclusions.

==Supporting examples==

The A-domains have 8 amino acid-long non-ribosomal signatures.<ref>{{Cite book|last=Compeau, Phillip|title=Bioinformatics algorithms : an active learning approach|others=Pevzner, Pavel.|year=2018|isbn=978-0-9903746-3-3|edition=3rd|___location=San Diego, CA|oclc=1060570224}}</ref>

'''LTKVGHIG''' → Asp (Aspartic acid)

'''VGEIGSID''' → Orn (Orinithine)

'''AWMFAAVL''' → Val (Valine)

==See also==

* [[Nonribosomal peptide]]

* [[Natural product]]

* [[Secondary metabolite]]

==References==

{{reflist}}

[[Category:Molecular biology]]

Modular Peptide Synthetases Involved in Nonribosomal Peptide Synthesis 1997

The enduracidin biosynthetic gene cluster from Streptomyces fungicidicus 2006

Characterisation of the ArmA adenylation ___domain implies a more diverse secondary metabolism in the genus Armillaria 2011

Characterization of the atromentin biosynthesis genes and enzymes in the homobasidiomycete Tapinella panuoides 2008

Specificity prediction of adenylation domains in nonribosomal peptide synthetases (NRPS) using transductive support vector machines (TSVMs) 2005