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. 1987 Dec 1;6(12):3801–3808. doi: 10.1002/j.1460-2075.1987.tb02716.x

Nuclear lamin LI of Xenopus laevis: cDNA cloning, amino acid sequence and binding specificity of a member of the lamin B subfamily.

G Krohne 1, S L Wolin 1, F D McKeon 1, W W Franke 1, M W Kirschner 1
PMCID: PMC553852  PMID: 3428276

Abstract

Lamins are karyoskeletal proteins associated with the nuclear envelope which can be divided into two groups, i.e. the type A lamins of near neutral pI and the more acidic lamins, including mammalian lamin B. We have isolated cDNA clones encoding a representative of the type B subfamily from Xenopus laevis, and have deduced its amino acid sequence from the coding portion of the approximately 2.9 kb mRNA. The polypeptide (mol. wt 66,433) is identified as a typical lamin by its homology to Xenopus human type A lamins, but detailed sequence comparison shows that LI is less related to Xenopus lamin A than the latter is to human lamin A. The conformation predicted for LI conforms to the general model of lamins and intermediate filament proteins and is characterized by an extended central alpha-helical coiled coil domain, flanked by non-alpha-helical domains, i.e. a relatively short N-terminal head and a long C-terminal tail. As in lamins A and C, the head of lamin LI is positively charged and the tail presents a similar C-terminal pentapeptide, a putative nuclear accumulation signal, a very negatively charged region and a number of short regions that are highly homologous in all lamins. However, LI differs from the type A lamins by the absence of the oligo-histidine stretch and a di-proline motif in the tail region and by a significantly lower number of identical amino acid positions.(ABSTRACT TRUNCATED AT 250 WORDS)

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