Central Rod Domain Lamin

Intron positions are conserved in other lamin genes from frogs mice and humans but different in lamin genes from drosophila and c.

Central rod domain lamin.

An escherichia coli expression system was used to produce full length lamin a and lamin c and truncated lamins retaining the central alpha helical rod domain residues 34 388 but lacking various amounts of the amino terminal head and carboxy terminal tail domains. Numerous mutations in the human a type lamin gene lmna cause the premature aging disease progeria. Some of these are located in the α helical central rod domain required for the polymerization of the nuclear lamins into higher order structures. The lamins have a conserved central helical rod domain flanked by globular head and tail domains.

Alternatively missense mutations in the rod domain of the lamin a c gene may alter interactions with cytoplasmic proteins in particular intermediate filament components of the sarcomere the. Each α helical segment has heptad repeat periodicity characteristic of coiled coil proteins and is connected by short intervening sub domains denoted l1 l12 and l2. Arg190trp affects a conserved amino acid position supplementary data in the central rod domain of lamin a c which interacts with emerin and lamin b. In vitro lamin dimers form head to tail chains which further.

As suggested by the first model all if proteins appear to have a central alpha helical rod domain that is composed of four alpha helical segments named as 1a 1b 2a and 2b separated by three linker regions. Exon 1 codes for the n terminal head domain and the first portion of the central rod domain exons 2 through 6 the central rod domain and exons 7 through 11 the c terminal tail domain. The central building block of an intermediate filament is a pair of two intertwined proteins that is called a coiled coil structure. Assembly of the nuclear lamina occurs via polymerization involving homodimerization head to tail assembly of homodimers and antiparallel assembly of.

We examined regions of human lamins a and c involved in binding to surfaces of mitotic chromosomes. An escherichia coli expression system was used to produce full length lamin a and lamin c and truncated lamins retaining the central alpha helical rod domain residues 34 388 but lacking various amounts of the amino terminal head and carboxy terminal tail domains. The central α helical or rod domain spans approximately half of the lamin molecule about 350 residues and comprises four α helical segments termed 1a 1b 2a and 2b. The central rod is responsible for the formation of in parallel and in register coiled coil dimers the building blocks of lamin polymers.