Harnessing cellulose-binding protein domains for the development of functionalized cellulose materials

Article type: Review Article

Keywords: Cellulosic materials, Cellulose-binding protein, Carbohydrate binding module, Material functionalization

Authors: Shaowei Li, Guodong Liu ⚬

Affiliations: https://ror.org/0207yh398grid.27255.370000 0004 1761 1174Taishan College, School of Life sciences, Shandong University, 72 Binhai Road, Qingdao, Shandong 266237 China; grid.27255.370000 0004 1761 1174State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao, Shandong 266237 China

License: © The Author(s) 2024 CC BY 4.0 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

Article links: DOI: 10.1186/s40643-024-00790-4  |  PubMed: 39052131  |  PMC: PMC11272768

Relevance: Relevant: mentioned in keywords or abstract

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Introduction

Cellulose is the most abundant biopolymer on Earth (Seddiqi et al. ref. 2021). Owing to their stability, high-yield, low-cost, and renewable characteristics, cellulose materials are widely used in various industries, including papermaking, textiles, packaging, and medicine (Chen et al. ref. 2022; Li et al. ref. 2024a, ref. b). With increasing demand for renewable resources and environmentally friendly materials, cellulose has attracted increasing attention as a biocompatible, biodegradable and widely sourced biomass material.

Cellulose is composed of β-1,4-linked d-glucose units (Heinze ref. 2016), and the degree of polymerization varies among different cellulose materials (Hallac and Ragauskas ref. 2011). The hydroxyl groups on the cellulose chain can form numerous intra- and intermolecular hydrogen bonds, resulting in a tightly ordered and insoluble crystalline structure. To enhance its solubility, thermoplasticity, hydrophobicity, and other desired properties, chemical modification of cellulose is often necessary. Each glucose monomer in the cellulose chain contains three hydroxyl groups that are susceptible to various chemical reactions, including oxidation, esterification, etherification, and graft copolymerization (Aziz et al. ref. 2022; Heinze ref. 2016). However, because cellulose easily decomposes under acidic or high-temperature conditions (Bartnik and Facey ref. 2017), it is necessary to strictly control the pH and temperature of the chemical reactions to prevent hydrolysis and oxidation, thus obtaining more complete cellulose chains (Coseri ref. 2017). In addition, some chemical reactions are characterized by low site selectivity, low reaction efficiency, and many side reactions, limiting their use in the improvement of cellulose materials (Wang et al. ref. 2018).

Carbohydrate-binding modules (CBMs) are commonly found in carbohydrate-active enzymes and non-catalytic proteins. The CBMs can interact with carbohydrates through non-covalent bonds and bring linked catalytic protein domain(s) to the surface of the substrate to enhance enzyme activity (Sidar et al. ref. 2020). Because of their high specificity, CBMs have been applied to develop technologies in diverse fields (Shoseyov et al. ref. 2006). For example, recombinant CBMs can serve as tags for protein purification via affinity chromatography (Oliveira et al. ref. 2015a, ref. b). Cellulose-binding domains (CBDs) found in lignocellulose-degrading enzymes or related proteins (e.g., scaffolds of bacterial cellulosomes) were among the earliest studied CBMs (Linder and Teeri ref. 1997). In terms of improving the performance of cellulose materials, CBDs have many advantages over other chemical methods, such as mild operating conditions, high specificity, reversibility, and diversity of functionalization forms. In this review we summarize the methods and applications of CBDs in the functionalization of cellulose materials. Future directions for the further development of highly efficient and low-cost materials based on CBDs are also discussed.

Types and structures of CBDs

Based on structural similarities, CBMs are classified into 101 families in the Carbohydrate-Active enZymes (CAZy) database (as of April 2, 2024) (Drula et al. ref. 2022). The modules in families 1, 2, 3, 4, 6, 8, 9, 10, 11, 16, 17, 28, 30, 37, 44, 46, 49, 59, 64, 65, 72, 76, 78, 79, 81, and 85 are reported to bind cellulose. Notably, the type of bound cellulose can differ among different CBM families; for example, the members of CBM1, CBM3, and CBM5 bind to crystalline cellulose, whereas those in CBM4 bind to amorphous cellulose. In addition, there are significant differences in the knowledge base of different CBM families. For example, 24 experimentally determined structures of CBM1 have been deposited in the RCSB PDB database (https://www.rcsb.org/). In contrast, only one structure each has been reported in the CBM9 and CBM10 families, and the cellulose-binding ability of the CBM72 family has been reported in only one case (Duan et al. ref. 2016).

CBDs in the CBM families 1, 2 and 3 are mostly used for the functionalization of cellulose materials. CBM1 is the earliest discovered CBM family (Van Tilbeurgh et al. ref. 1986). The first structure determined in this family was the CBD of cellobiohydrolase I in Trichoderma reesei, which contains 36 amino acids (Kraulis et al. ref. 1989) (Fig. 1A). This domain has a wedge-like shape, with one side mainly hydrophilic and the other hydrophobic (Kraulis et al. ref. 1989). Tyr5, Tyr31, and Tyr32, located on the flat and hydrophilic face, are believed to be directly involved in binding to cellulose (Shiiba et al. ref. 2013). Two CBM2 domains were first discovered in the endo-β-1,4-glucanase CenA and exo-β-1,4-glucanase Cex from Cellulomonas fimi (Gilkes et al. ref. 1988). The 110-residue CBD in Cex is rich in β-sheets and has a β-barrel fold (Xu et al. ref. 1995) (Fig. 1B). The surface residues Trp17, Trp54, and Trp72 are considered to be important for binding to cellulose (McLean et al. ref. 2000). The CBM3 domain was first identified in a cellulosomal-scaffolding protein of Clostridium thermocellum (Poole et al. ref. 1992). This domain comprises approximately 150 amino acids and has a β-jelly roll structure similar to that of CBM2 (Tormo et al. ref. 1996) (Fig. 1C). The β-sheets form two flat surfaces, and Trp118, Arg112, Asp56, His57, and Tyr67 on one surface are assumed to directly contact with the cellulose chain (Tormo et al. ref. 1996). CBDs in the three families seem to share a conserved mechanism of interacting with crystalline cellulose through linearly arranged aromatic and polar residues. Notably, CBM3 domains feature the most extensive planar surface area, effectively engaging with three cellulose chains simultaneously.

Methodologies for the functionalization of cellulose materials using CBDs

CBDs can be used directly to change the physical and chemical properties of cellulose (Fig. 2A; examples are given in the next section). However, in most cases, CBDs are used to modify cellulose by linking other molecules to its surface, thereby greatly extending its function (Barbosa et al. ref. 2021; Yang et al. ref. 2015). Molecules can be tethered to the cellulose surface via CBDs in different ways. First, functional proteins or peptides, such as enzymes and antimicrobial peptides, can be genetically fused to CBDs to improve the performance of materials or endow materials with new characteristics (Fig. 2B). Second, molecules can be indirectly linked to the CBDs, and consequently, to the cellulose surface through noncovalent interactions (Fig. 2C); for example, streptavidin can be fused with CBDs to provide a platform for binding of various biotinylated molecules (Pelus et al. ref. 2021). Similarly, antibodies can be anchored to cellulose surface by using fusion constructs of CBD and staphylococcal protein A. Lastly, functional molecules can be anchored to CBDs by covalent bonds, usually through “click chemistry” strategies (Fig. 2D) (Geng et al. ref. 2021). An azide group can be introduced into the CBD through the incorporation of a noncanonical amino acid, and functional molecules can then be added via azide-alkyne cycloaddition under physiological conditions (Agard et al. ref. 2005). Alternatively, molecules can be conjugated to the CBD through cysteine-maleimide chemistry, which does not require the use of noncanonical amino acids (Barbosa et al. ref. 2021; Pfaff et al. ref. 2022). Additionally, primary amines on the surface of natural CBDs can be employed for the conjugation of molecules after the introduction of alkyne groups (Aïssa et al. ref. 2019). The SpyCatcher-SpyTag system can also be used to construct CBD-containing complexes by forming covalent bonds (Griffo et al. ref. 2019). Using the above strategies, various molecules (e.g., proteins, peptides, oligonucleotides, and small compounds) can be anchored to the surface of cellulose through the mediation of CBDs.

Improving the properties of cellulose materials with CBDs

Some CBDs can disrupt the crystalline structure of cellulose even in the absence of a catalytic domain. Therefore, the use of CBDs alone could alter certain features of cellulose. As an example, CBM2 was mixed with cotton to enhance the affinity of cotton cellulose to dyes; however, the dyes were found to easily wash away under alkaline conditions (Cavaco-Paulo et al. ref. 1999). In addition, CBDs have been used to improve the hydrophobicity, drainability, and strength of paper (Oliveira et al. ref. 2015b; Pala et al. ref. 2001). A recent study showed that incorporating CBM3 into bacterial cellulose can improve its strength and ductility under various conditions (Liu et al. ref. 2023). Double CBDs connected by a linker peptide are believed to have a crosslinking effect on the fibers, which enhances the mechanical strength of the paper material (Levy et al. ref. 2002). Nevertheless, CBDs belonging to different CBM families exhibit different improvements in the paper properties (Shi et al. ref. 2014).

Fusing CBDs with other molecules greatly expands their potential to improve the properties of cellulose materials. These molecules include abiotic compounds, enzymes with surface modification activities, and proteins or peptides that can bind to other materials. One example is modification of the cellulose surface with polyethylene glycol-linked CBM2, which improves the redispersion of cellulose nanocrystals after drying and the stability of the suspension; this method can be used to prepare self-assembled nanoparticles from polysaccharides and proteins (Aïssa et al. ref. 2019). By fusing a cutinase that hydrolyze acetyl groups to CBDs, the wettability and dyeability of cellulose acetate fibers are reportedly significantly improved after treatment, and the effect was greater than that obtained using cutinase only (Zhang et al. ref. 2012). Silicatein, a silica-polymerizing enzyme, can form a silica layer on the cellulose surface when fused with CBM3. This fusion facilitates direct interaction between silicatein and cellulose, enabling the deposition of silica in proximity to cellulose fibers (Godigamuwa et al. ref. 2020). In another study, CBM1 was fused to the class II hydrophobin HFBI, which was connected to graphene through hydrophobic interactions, achieving graphene fixation on nanofibrillated cellulose to enhance its mechanical properties (e.g., ultimate tensile strength) (Laaksonen et al. ref. 2011). In the latter two studies, the authors revealed that CBDs can mediate the hybridization of organic and inorganic materials, providing new possibilities for improving material properties.

Combining CBM with other functional molecules can endow cellulose materials with new features. An antimicrobial hexapeptide was linked to CBM3 and fixed onto cellulose, which greatly improved the antibacterial activity of cellulose materials, thus offering the prospect of medical applications of cellulose (Barbosa et al. ref. 2022). The fusion of lysozyme with CBM2 can also endow cellulosic materials with antibacterial activity (Abouhmad et al. ref. 2016). The combination of CBM3 with the ZZ fragment derived from protein A (Nilsson et al. ref. 1987), along with an anti-biotin antibody, was used to immobilize biotin-labeled gold nanoparticles (AuNPs) onto cellulose materials. With the aid of such CBM3-ZZ-antibody complexes, a uniform distribution of AuNPs on the cellulose surface was achieved. This approach holds promise for imparting novel optical, electronic, and chemical functionalities to cellulose-based substrates (Almeida et al. ref. 2017). Moreover, by connecting CBDs with metallothionein or a hexa-histidine tag, cellulose has been adapted to remove toxic metal ions (Togo et al. ref. 2020; Xiao et al. ref. 2020). Similarly, macromolecules can be adsorbed and fixed onto cellulose materials. For example, mini-proteins targeting the receptor-binding domain of SARS-CoV-2 were fused with CBDs, which can be used to capture viral particles on masks, reducing the possibility of cell infection by 500 times (Navone et al. ref. 2022).

Immobilizing enzymes for biocatalysis with CBDs

The ability of CBDs to anchor fused enzymes to the cellulose surface makes cellulose a convenient support matrix for enzyme immobilization. Oriented adsorption of enzymes aided by CBDs has the advantages of lower activity loss and less protein aggregation. In addition, the procedures for the purification and immobilization of enzymes may be combined when CBD tags are used, and sometimes the tag can improve the soluble expression of the target enzymes (Liao et al. ref. 2012). With immobilization on cellulose, enzymes can be easily recycled (Estevinho et al. ref. 2018), and their stability and catalytic efficiency have been reported to be improved in many cases (Table 1). Notably, the effects of CBD fusion and cellulose immobilization on enzyme performance may vary depending on the type of CBDs. For example, different kinds of CBDs were genetically fused with cis-epoxysuccinic acid hydrolase and subsequently immobilized on cellulose to evaluate their catalytic efficiencies. By screening five CBDs from four CBM families, CBM30 from C. thermocellum was found to be the best “partner” of cis-epoxysuccinic acid hydrolase, with the immobilized fusion enzyme showing a 140% increase in catalytic efficiency compared with the free native enzyme (Wang et al. ref. 2012).

CBDs have also been used for the co-immobilization of enzymes on cellulose surfaces for multi-enzymatic cascade reactions. The reaction rate can be enhanced by the substrate channeling effect in such cascades (Wang et al. ref. 2023). Inspired by the organization of bacterial cellulosomes, researchers have used CBM3, cohesins, and dockerins from this natural multi-enzyme machine to assemble and immobilize triosephosphate isomerase, aldolase, and fructose 1,6-biphasase onto cellulose. This method of enzyme complex construction has been found to not only reduce the workload of protein purification, but also increase the reaction rate by one order of magnitude compared to a mixture of free enzymes (You and Zhang ref. 2013). Further development of cellulose-containing magnetic nanoparticles as a support material has allowed easier and more selective control of the reactions (Myung et al. ref. 2013).

Designing of detection tools with CBDs

When linked to sensory molecules or enzymes, CBDs can be used in the detection of substances or physicochemical signals (Fig. 3). For example, a pH-sensitive enhanced cyan fluorescence protein was fused to CBM2 to monitor the extracellular pH in live tissues growing on cellulose scaffolds using fluorescence lifetime imaging microscopy (O’Donnell et al. ref. 2018).

To construct enzyme-based biosensor devices, enzymes are usually fixed on electrodes via random immobilization methods (e.g., glutaraldehyde crosslinking), which may lead to decreased enzyme activity and low sensitivity. The oriented immobilization of proteins on cellulose using CBDs represents a significant advancement in the development of high-performance biosensor devices. This method enables precise control over protein orientation and density on the cellulose surface, thereby enhancing the sensitivity, specificity, and stability of biosensors for various analytical applications. Researchers have immobilized glucose oxidase onto a cellulose-based electrode using CBM2, which enabled the development of a glucose biosensor that responded linearly to glucose concentration changes over a large range with high stability and repeatability (Gong et al. ref. 2021). Similarly, an FAD-dependent glucose dehydrogenase was fixed on a nanocellulose modified electrode to detect glucose with high sensitivity and stability (Han et al. ref. 2021).

After fusion with antibodies, CBDs can be used to develop devices for detecting corresponding antigens. The lateral flow assay (LFA) is an important method for point-of-care testing and is characterized by rapid detection, portability, and ease of operation. Nevertheless, the sensitivity and specificity of LFA are still lower than those of enzyme-linked immunosorbent assay (ELISA) and PCR methods (Liu et al. ref. 2021). Nitrocellulose membranes for the physical adsorption of antibodies are commonly used as analytical strips in LFA, which have the drawback of lowering antibody activity due to random adsorption. The interaction between CBDs and cellulose has been employed to develop cellulose-based LFAs, in which antibodies are directly or indirectly immobilized on strips with the aid of CBDs (Table 2). CBDs can help control the orientation of antibodies on strips, thereby improving the sensitivity of detection. In addition, the replacement of nitrocellulose with cellulose is expected to reduce the manufacturing costs of LFAs.

This strategy of antibody immobilization on cellulose has also been used for DNA detection. In an earlier report, a CBM3-ZZ fragment fusion product was used to anchor an anti-biotin antibody to cellulose, which captured DNA hybrids formed by biotin-labeled targets and fluorescein-labeled probes. The detection results were reflected by fluorescence signals (Rosa et al. ref. 2014). The system was characterized using fluorescence correlation spectroscopy to further validate its effectiveness (Rosa et al. ref. 2017). Fluorescence correlation spectroscopy provides detailed insights into the dynamics and interactions of biomolecules immobilized on the cellulose surface, confirming the reliability and functionality of the detection system. When fluorescein in the above system was replaced with AuNPs, the detection results could be directly observed with the naked eye (Rosa et al. ref. 2019).

When CBDs are connected or integrated with living organisms, such as bacteria, their detection range is further expanded. CBM2 was fused to the cell-surface protein OmpA and expressed in Escherichia coli, enabling it to bind to cellulose. Using this platform, a live bacterial sensor for L-arabinose based on fluorescence intensity was constructed (Long et al. ref. 2021). In another study, E. coli-specific phage T7 was engineered to express chimeric proteins comprising CBM2 and reporter enzymes (luciferase or alkaline phosphatase). These phages were used to infect and lyse E. coli cells, releasing reporter enzymes onto the cellulose membrane or magnetic cellulose particles for enzymatic reactions and signal production. This method of bacterial detection has the advantages of being both rapid and user-friendly (Hinkley et al. ref. 2018; Singh et al. ref. 2019).

Prospects

The specific affinity of CBDs for cellulose has great potential not only for cellulose modification, but also for immobilizing enzymes and other molecules on cellulosic materials. In the near future, CBDs are expected to be applied in medical diagnosis field. With the increasing demand for sustainable materials, CBDs are expected to have broader and more profound application prospects in multiple fields. In particular, the biocompatibility of cellulose materials and at least some CBDs is beneficial for in vivo biomedical applications (Żebrowska et al. ref. 2024). Nevertheless, the applications of CBDs summarized in this review are still in the laboratory stage and there is still a lot of room for improvement in their performance and cost effectiveness. The main challenges and opportunities are described as follows.

First, CBD-based fusion proteins are mainly produced in E. coli; the relatively high costs of induced protein production, cell lysis, and protein purification may hinder their application in bulk materials. Secreted production in well-established industrial protein hosts (e.g., Bacillus subtilis and Pichia pastoris secrete tens of grams of protein per liter) and the selection of thermostable proteins with long half-lives are expected to lower the costs of industrial application of such fusion proteins.

Second, protein engineering strategies can be used to generate high-performance CBDs that satisfy the requirements of more application scenarios (e.g., higher affinity, higher stability, and controlled desorption). In terms of directed evolution, a mutant library of natural CBDs can be constructed and subjected to high-throughput screening. This strategy has been successfully used to develop plastic-binding peptides based on an E. coli cell surface display screening system (Apitius et al. ref. 2019). With the rapid development of structural bioinformatics, rational design and machine learning techniques are expected to effectively accelerate the development of CBDs with new characteristics.

Third, in most studies on the functionalization of cellulosic materials, researchers have chosen to use CBDs belonging to CBM families 1, 2, and 3, particularly CBM3. CBDs from other CBM families as well as cellulose-binding peptides of other origins (Qi et al. ref. 2008) are worth testing for their performance. In addition, CBDs of different structures may differ in terms of substrate specificity. For example, fluorescently-tagged CBM2 and CBM17 were used to detect the spatial distribution of crystalline and paracrystalline cellulose in cellulosic materials, respectively (Novy et al. ref. 2020). By combining different types of CBDs and lithography technologies, patterning of cellulosic materials may be achieved to offer competitive advantages for applications (Wolfberger et al. ref. 2015).

Lastly, some CBDs have been reported to bind to other polymer materials, such as chitin and synthetic plastics (Ekborg et al. ref. 2007; Rennison et al. ref. 2023). The degradation of chitin and polyethylene terephthalate was significantly enhanced by fusing CBDs with the corresponding hydrolytic enzymes (Limón et al. ref. 2001; Ribitsch et al. ref. 2013). With a deeper understanding and engineering of the interactions between CBDs and polymers, the application of CBDs in the functionalization of materials can be expanded.

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