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Two actin-encoding cDNAs (act1 and act2) from Gecarcinus lateralis have been sequenced or partially sequenced and the corresponding proteins deduced. The actl cDNA has a complete ORF; the act2 cDNA lacks most of the 5′ end of the coding region. The nucleotide (nt) sequences of both clones are very similar to act sequences of many organisms, the most closely related being from another arthropod, the silkmoth Bombyx mori. The proteins Actl and Act2 are more similar to vertebrate cytoplasmic actin isoforms (β-actins) than to vertebrate muscle actins (α-actins); they are also more similar to animal actins than to those of fungi or plants. Codon usage is strongly biased toward C or G in the third position. The deduced number of amino acid (aa) residues and calculated M_r for Actl are 376 aa and 41.94 kDa, respectively. The deduced aa sequence of Actl is very similar to those of muscle actins of B. mori and …