Carbonic anhydrase 6 is an enzyme that in humans is encoded by the CA6gene.[1][2] It is also called 'gustin' because of its presence in saliva, and lower-than-normal levels of salivary zinc in individuals with hypogeusia.[3][4]
The protein encoded by this gene is one of several isozymes of carbonic anhydrase. This protein is abundantly found in salivary glands and saliva and protein may play a role in the reversible hydratation of carbon dioxide, though its function in saliva is unknown.[2]
It has been suggested that CA VI participates in the maintenance of appropriate pH homeostasis on tooth surfaces as well as in the mucosa of the gastrointestinal canal.
Nishimori I, FujikawaAdachi K, Onishi S, Hollingsworth MA (June 1999). "Carbonic anhydrase in human pancreas: hypotheses for the pathophysiological roles of CA isozymes". Annals of the New York Academy of Sciences. 880: 5–16. doi:10.1111/j.1749-6632.1999.tb09505.x. PMID10415846.
Parkkila S, Kaunisto K, Rajaniemi L, Kumpulainen T, Jokinen K, Rajaniemi H (July 1990). "Immunohistochemical localization of carbonic anhydrase isoenzymes VI, II, and I in human parotid and submandibular glands". The Journal of Histochemistry and Cytochemistry. 38 (7): 941–7. doi:10.1177/38.7.2113069. PMID2113069.
Murakami H, Sly WS (January 1987). "Purification and characterization of human salivary carbonic anhydrase". The Journal of Biological Chemistry. 262 (3): 1382–8. PMID2433278.
Sutherland GR, Baker E, Fernandez KE, Callen DF, Aldred P, Coghlan JP, Wright RD, Fernley RT (1989). "The gene for human carbonic anhydrase VI(CA6) is on the tip of the short arm of chromosome 1". Cytogenetics and Cell Genetics. 50 (2–3): 149–50. doi:10.1159/000132746. PMID2505973.
Ogawa Y, Hong SS, Toyosawa S, Kuwahara H, Shimazaki M, Yagi T (March 1993). "Immunoelectron microscopy of carbonic anhydrase isozyme VI in human submandibular gland: comparison with isozymes I and II". The Journal of Histochemistry and Cytochemistry. 41 (3): 343–51. doi:10.1177/41.3.8429198. PMID8429198.
Kivelä J, Parkkila S, Waheed A, Parkkila AK, Sly WS, Rajaniemi H (December 1997). "Secretory carbonic anhydrase isoenzyme (CA VI) in human serum". Clinical Chemistry. 43 (12): 2318–22. PMID9439449.
Thatcher BJ, Doherty AE, Orvisky E, Martin BM, Henkin RI (September 1998). "Gustin from human parotid saliva is carbonic anhydrase VI". Biochemical and Biophysical Research Communications. 250 (3): 635–41. doi:10.1006/bbrc.1998.9356. PMID9784398.
Leinonen J, Kivelä J, Parkkila S, Parkkila AK, Rajaniemi H (1999). "Salivary carbonic anhydrase isoenzyme VI is located in the human enamel pellicle". Caries Research. 33 (3): 185–90. doi:10.1159/000016515. PMID10207193.
Leinonen J, Parkkila S, Kaunisto K, Koivunen P, Rajaniemi H (May 2001). "Secretion of carbonic anhydrase isoenzyme VI (CA VI) from human and rat lingual serous von Ebner's glands". The Journal of Histochemistry and Cytochemistry. 49 (5): 657–62. doi:10.1177/002215540104900513. PMID11304804.