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What Is Sequence Motif Analysis
What is Sequence Motif Analysis?
✍: FYIcenter.com
In biology, a sequence motif is a nucleotide or amino-acid sequence pattern that is widespread and usually assumed to be related to biological function of the macromolecule.
For example, an N-glycosylation site motif can be defined as Asn, followed by anything but Pro, followed by either Ser or Thr, followed by anything but Pro residue. This N-glycosylation motif can be expressed as:
N-glycosylation Motif = N{P}[ST]{P} where: N = Asn P = Pro S = Ser T = Thr {X} means any amino acid except X [XY] means either X or Y.
Formally, the above motif pattern example is defined by the following rules.
The PROSITE data uses a lightly different notation to express sequence motif with the following extra rules:
For example, motif for the C2H2-type zinc finger domain in PROSITE notation is:
C-x(2,4)-C-x(3)-[LIVMFYWC]-x(8)-H-x(3,5)-H
If you are familiar with regular expression, sequence motif can also be expressed as a regular expression. For example:
N-glycosylation Motif = /N[^P][ST][^P]/ C2H2-type zinc finger domain = /C.{2,4}C.{3}[LIVMFYWC].{8}H.{3,5}H/
⇒ Create Motif With Biopython Bio.motifs Module
⇐ Biopython for Sequence Motif Analysis
2023-07-11, 392🔥, 0💬
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