Because of a lapse in government funding, the information on this website may not be up to date, transactions submitted via the website may not be processed, and the agency may not be able to respond to inquiries until appropriations are enacted. The NIH Clinical Center (the research hospital of NIH) is open. For more details about its operating status, please visit cc.nih.gov. Updates regarding government operating status and resumption of normal operations can be found at opm.gov.

NLM Logo

Lactose Synthase MeSH Descriptor Data 2025


MeSH Heading
Lactose Synthase
Tree Number(s)
D05.500.299
D08.811.913.400.450.400.500
Unique ID
D007788
RDF Unique Identifier
http://id.nlm.nih.gov/mesh/D007788
Scope Note
An enzyme complex that catalyzes the transfer of GALACTOSE from UDP GALACTOSE to GLUCOSE, forming LACTOSE. The enzyme complex is composed of a B subunit, ALPHA-LACTALBUMIN, which changes the substrate specificity of the A subunit, N-ACETYLLACTOSAMINE SYNTHASE, from N-ACETYLGLUCOSAMINE to glucose making lactose synthesis the preferred reaction.
Entry Term(s)
Lactose Synthetase
N-Acetylgucosamide 1-4 beta Galactosyl Transferase
Registry Numbers
EC 2.4.1.22
0
Related Numbers
9030-11-9
CAS Type 1 Name
UDPgalactose:D-glucose 4-beta-D-galactosyltransferase
Previous Indexing
Glucosyltransferases (1966-1971)
Lactation (1966-1971)
Ligases (1966-1971)
Transferases (1966-1971)
Public MeSH Note
92; was LACTOSE SYNTHETASE 1974-91
Online Note
use LACTOSE SYNTHASE to search LACTOSE SYNTHETASE 1972-91 (as Prov 1972-73)
History Note
92: was LACTOSE SYNTHETASE 1972-91 (Prov 1972-73)
Date Established
1974/01/01
Date of Entry
1999/01/01
Revision Date
2015/06/12
Lactose Synthase Preferred
N-Acetylgucosamide 1-4 beta Galactosyl Transferase Narrower
page delivered in 0.135s