Sequence, recombinant expression and tissue localization of two novel extracellular matrix proteins, fibulin-3 and fibulin-4

Matrix Biol. 1999 Oct;18(5):469-80. doi: 10.1016/s0945-053x(99)00038-4.

Abstract

Fibulin-1 and fibulin-2 have previously been identified as basement membrane and microfibrillar proteins with a broad binding repertoire for other extracellular ligands. Here we report on the cloning and sequence analysis of human fibulin-3 (487 residues), also known as protein S1-5, and fibulin-4 (443 residues). These novel members of this protein family are most closely related to fibulin-1C. They consist of a C-terminal globular domain III, also shared by the fibrillins, a central rod-like element composed of five calcium-binding epidermal growth factor-like (EG) modules (domain II) and an N-terminal interrupted EG module (domain I) which replaces the anaphylatoxin-like modules of the other fibulins. This predicted domain structure was supported by electron microscopy of fibulin-4, which demonstrated short rods. Northern blots showed that both novel fibulins are expressed in several human tissues to a variable extent and that they are up-regulated in quiescent fibroblasts. Specific antibodies which were raised against each of the novel fibulins did not cross-react with fibulin-1. Immunohistology of adult mouse tissues showed that fibulin-3, fibulin-4 and fibulin-1 have overlapping but distinct extracellular tissue localizations. A particularly prominent feature was the staining of variable sets of large and small blood vessels.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • Calcium-Binding Proteins / chemistry
  • Calcium-Binding Proteins / genetics
  • Calcium-Binding Proteins / metabolism
  • Cloning, Molecular
  • DNA Primers / genetics
  • DNA, Complementary / genetics
  • Extracellular Matrix Proteins / chemistry
  • Extracellular Matrix Proteins / genetics*
  • Extracellular Matrix Proteins / metabolism*
  • Fluorescent Antibody Technique
  • Gene Expression
  • Humans
  • Mice
  • Microscopy, Electron
  • Molecular Sequence Data
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism
  • Recombinant Proteins / chemistry
  • Recombinant Proteins / genetics
  • Recombinant Proteins / metabolism
  • Sequence Homology, Amino Acid
  • Tissue Distribution

Substances

  • Calcium-Binding Proteins
  • DNA Primers
  • DNA, Complementary
  • Extracellular Matrix Proteins
  • RNA, Messenger
  • Recombinant Proteins
  • fibulin
  • fibulin 2
  • fibulin-4

Associated data

  • GENBANK/AJ132819