M. Mariyama et al., COMPLETE PRIMARY STRUCTURE OF THE HUMAN ALPHA-3(IV) COLLAGEN CHAIN - COEXPRESSION OF THE ALPHA-3(IV) AND ALPHA-4(IV) COLLAGEN CHAINS IN HUMAN TISSUES, The Journal of biological chemistry, 269(37), 1994, pp. 23013-23017
We report the entire primary structure of the human alpha 3(IV) collag
en chain determined from cDNA clones and polymerase chain reaction-amp
lified DNAs. The deduced amino acid sequence demonstrates that the com
plete translation product consists of 1670 amino acid residues and the
mature alpha 3(IV) chain contains 1642 residues with a corresponding
calculated molecular mass of 161,753. The full-length translated polyp
eptide has a signal peptide of 28 amino acids, a 1410-residue collagen
ous domain starting with a 14-residue noncollagenous sequence, and a 2
32-residue NC1 domain. There are 23 noncollagenous interruptions in th
e Gly-X-Y repeat sequence of the collagenous domain. The major transcr
iption start site of the alpha 3(IV) chain gene was also determined fr
om genomic DNA by primer extension and S1 nuclease protection assays.
Northern analysis revealed coexpression of the alpha 3(IV) and alpha 4
(IV) chains in tissues where expression was observed such as in kidney
, muscle, and lung.