A brief on: Domain Families & Classification

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Presentation transcript:

A brief on: Domain Families & Classification

Classification to Families We can classify proteins into families by: A. Sequence B. Structure C. Function (annotation) D. Evolution

Used Terms: Motif = Domain = Signature = Profile = Seed Family = Cluster These terms are used interchangeably, They are very (too) flexible

Motif = Domain = Function ??? A motif is a sequence signature. Structural definition of a domain: an independently folding structural unit. A protein family is not well-defined. Protein function is not well-defined (some proteins can have several functions). Conclusion: these terms are used interchangeably, but they are very flexible.

Protein folds Toxin binding protein (TolB) Glucose dehydrogenase Di-isopropyl-fluorophosphatase

Dominant domain fold types. Holm and Sander. PROTEINS: Structure, Function, and Genetics 33:88–96 (1998)

Why Research Protein Families? Function prediction and annotation. Evolutionary research - finding orthologs and paralogs. Search for new protein folds. Functional research by similarity in characteristics.

Domains are the building blocks of evolution: some facts.. Each occurs in diverse sets of protein families Number of domains in proteins ranges from 1 up to tens Structural based domain are ~ 150 aa Length varies: some are very short 30-40 aa, other are long > 500 aa Domain definition is somewhat blurred Domain boundary is an unsolved problem Pyruvate kinase, PDB:1pkn

How is a novel gene born? Domains are the evolutionary units of sequence that comprise the gene coding regions. Most genes are built from more than one domain. Novel genes can be created by recombination of domains into new domain arrangements.

Correspondence between functional associations and genes linked by the fusion method From Glycolysis: M. genitalium PGK Glycerone-P M. genitalium TIM PGK1 M. genitalium GAPDH Glyceraldehyde-3P GAPDH Glycerate-1,3P2 Thermotoga Maritima PGK+TIM TIM Strart with this one Lines coming out Glycerate-3P Phytophthora infestans TIM+GAPDH

What is a Protein Family? Protein family: A group of proteins that have a common protein ancestor. Is it that simple? Domains: non-linear evolution Who is in this family?

A protein can have several same or different domains Fibronectin protein–1fnf

The Power of Integration Pfam, Prosite, SMART, PRINTS, tigrFam, ProDom SCOP CATH FSSP GO KEGG Pfam, Prosite, SMART, PRINTS, tigrFam, ProDom InterPro