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Cellulase linkers are optimized based on domain type and function: insights from sequence analysis, biophysical
Deanne W Sammond1, Christina M Payne, Roman Brunecky
1Biosciences Center, National Renewable Energy Laboratory, Golden, Colorado, USA.
Plos One
|November 10, 2012
Summary
Cellulase linkers, connecting enzyme domains, show optimized lengths and glycosylation patterns. These features suggest linkers play a functional role in enzyme activity beyond just connecting domains.
Area of Science:
- Biochemistry
- Enzymology
- Molecular Biology
Background:
- Cellulase enzymes are crucial for deconstructing cellulose into glucose.
- They typically consist of glycoside hydrolases (GHs) and carbohydrate-binding modules (CBMs) connected by linkers.
- The precise functional role of these linkers, beyond structural connectivity, is largely unexplored.
Purpose of the Study:
- To investigate conserved characteristics of cellulase linkers across bacterial and eukaryotic enzymes.
- To understand the potential functional implications of linker length, amino acid composition, and glycosylation patterns.
- To identify features suggesting tailored linker function in cellulase activity.
Main Methods:
- Comparative sequence analysis of cellulase linkers from various sources.
- Examination of linker lengths in relation to GH and CBM types.
- Analysis of proline content and O-glycosylation/N-glycosylation site distribution.
- Consideration of domain order and its impact on linker characteristics.
Main Results:
- Linker lengths appear optimized based on specific GH and CBM combinations.
- Eukaryotic GH Family 6 cellulases exhibit longer linkers than GH Family 7.
- O-glycosylation is widespread, suggesting roles in proteolysis protection and extension; proline content varies between bacterial and eukaryotic linkers.
- Glycine prevalence near termini suggests flexibility for domain orientation; N-glycosylation is rare due to common N-P motifs.
Conclusions:
- Cellulase linkers possess conserved, tailored features suggesting functional roles beyond mere connectivity.
- Linker characteristics, including length and glycosylation, likely contribute to optimal cellulase enzyme action.
- Further research is needed to fully elucidate the specific functions of cellulase linkers in enzyme activity.
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