Nematode beta-tubulin (None standardized; sometimes abbreviated as β-tubulin or TUBB in gene-centric contexts, but “beta-tubulin” is generally spelled out in nematode literature.)

Nematode beta-tubulin is the beta subunit of tubulin proteins forming microtubules in nematodes. As a core component of the cytoskeleton, it forms heterodimers with alpha-tubulin to construct microtubules, which are involved in cell division, polarity, transport, and structural integrity. Beta-tubulin in nematodes exhibits sequence diversity (isotypes) relevant for tissue-specific functions and confers sensitivity to benzimidazole drugs, which bind this subunit to disrupt microtubule dynamics and kill the parasite. Single-point mutations in certain positions (notably codons 167, 198, and 200) of the beta-tubulin gene are the principal genetic mechanism underpinning benzimidazole resistance in nematode populations. Thus, nematode beta-tubulin is a validated and extensively exploited therapeutic target in anti-parasitic chemotherapy, especially for controlling helminth infections in humans and animals.

Other names

β-tubulinTubulin beta chain*tbb* genes (gene symbols, e.g., *tbb-1*, *tbb-2* in C. elegans)Microtubule subunit beta (relevant in older or species-specific literature)

Drugs such as benzimidazoles bind to beta-tubulin and inhibit microtubule polymerization, leading to disruption of essential cellular processes and death in nematodes. This interaction is highly species- and isotype-dependent, conferring selective toxicity to nematodes and some resistance mechanisms via point mutations in β-tubulin.