PMID- 10095065 OWN - NLM STAT- MEDLINE DCOM- 19990506 LR - 20190610 IS - 0006-3002 (Print) IS - 0006-3002 (Linking) VI - 1444 IP - 3 DP - 1999 Mar 19 TI - Molecular cloning and biochemical characterization of a truncated, secreted member of the human family of Ca2+-activated Cl- channels. PG - 418-23 AB - A novel family of chloride channel proteins has recently been discovered including two bovine (Lu-ECAM-1, bCLCA1), one murine (mCLCA1), and two human (hCLCA1 and hCLCA2) members. Here, we describe the cloning, expression, and molecular characterization of a truncated human homolog, tentatively named hCLCA3. It was cloned from a human spleen cDNA library and is expressed in numerous tissues including lung, trachea, spleen, thymus, and mammary gland as determined by reverse transcriptase-polymerase chain reaction. Unlike all previously known CLCA family members which consistently encode an approximately 125-kDa transmembrane protein that is cleaved to form a heterodimer of two proteins of approximately 90 and 35 kDa, the 3.6-kb hCLCA3 mRNA encodes a 37-kDa glycoprotein that corresponds to the N-terminal extracellular domain of its homologs. Moreover, when expressed in human embryonic kidney 293 or Chinese hamster ovary cells, this 37-kDa glycoprotein is secreted into the culture supernatant. These observations suggest that hCLCA3 is a structurally divergent member of the CLCA family of proteins and that it does not act as a channel protein but has distinct, yet unidentified functions. FAU - Gruber, A D AU - Gruber AD AD - Department of Molecular Medicine, Cancer Biology Laboratories, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA. FAU - Pauli, B U AU - Pauli BU LA - eng SI - GENBANK/AF043976 GR - CA47668/CA/NCI NIH HHS/United States GR - CA71626/CA/NCI NIH HHS/United States PT - Comparative Study PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, P.H.S. PL - Netherlands TA - Biochim Biophys Acta JT - Biochimica et biophysica acta JID - 0217513 RN - 0 (CLCA3P protein, human) RN - 0 (Chloride Channels) RN - 0 (DNA, Complementary) RN - 0 (Membrane Glycoproteins) SB - IM MH - Amino Acid Sequence MH - *Chloride Channels MH - Cloning, Molecular MH - DNA, Complementary/chemistry MH - Humans MH - Membrane Glycoproteins/biosynthesis/chemistry/*genetics MH - Molecular Sequence Data MH - Sequence Alignment EDAT- 1999/03/30 00:00 MHDA- 1999/03/30 00:01 CRDT- 1999/03/30 00:00 PHST- 1999/03/30 00:00 [pubmed] PHST- 1999/03/30 00:01 [medline] PHST- 1999/03/30 00:00 [entrez] AID - S0167-4781(99)00008-1 [pii] AID - 10.1016/s0167-4781(99)00008-1 [doi] PST - ppublish SO - Biochim Biophys Acta. 1999 Mar 19;1444(3):418-23. doi: 10.1016/s0167-4781(99)00008-1.