Abstract:
:Fibulin-2 is a new extracellular matrix protein that we recently identified by characterizing mouse cDNA clones. Fibulin-2 mRNA is prominently expressed in mouse heart tissue and is present in low amounts in other tissues. In this study, we isolated and sequenced a 4.1-kb human fibulin-2 cDNA, which encoded a mature protein of 1157 amino acids preceded by a 27-residue signal sequence. The predicted polypeptide contains three consecutive anaphylatoxin-related segments (domain I) in its central region followed by 10 EGF-like repeats (domain II), 9 of which have a consensus sequence for calcium binding. The 408-residue N-terminal region consists of two separate subdomains, a cysteine-rich segment of 150 residues (Na subdomain) and a cysteine-free segment with a stretch of acidic amino acids (Nb subdomain). The 115-residue C-terminal segment (domain III) is similar to the C variant of fibulin-1. The amino acid sequences of the human and mouse fibulin-2 share approximately 90% identity in domains Na, I, II, and III but only 62% identity in domain Nb. The human cDNA lacks an EGF-like repeat, which is alternatively spliced in the mouse cDNA clones, and a potential cell-binding Arg-Gly-Asp sequence found in the Nb domain of the mouse counterpart. Northern blot analysis of mRNA from various human tissues reveals an abundant 4.5-kb transcript in heart, placenta, and ovary tissue. The expression pattern differs from that of fibulin-1. The fibulin-2 gene was localized by in situ hybridization to the p24-p25 region of human chromosome 3 and to the band D-E of mouse chromosome 6.
journal_name
Genomicsjournal_title
Genomicsauthors
Zhang RZ,Pan TC,Zhang ZY,Mattei MG,Timpl R,Chu MLdoi
10.1006/geno.1994.1404subject
Has Abstractpub_date
1994-07-15 00:00:00pages
425-30issue
2eissn
0888-7543issn
1089-8646pii
S0888-7543(84)71404-2journal_volume
22pub_type
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