BIOMAT Database Logo BIOMAT Database Logo

On the reactivities of the tryptophan residues of human alpha-lactalbumin to 2-hydroxy-5-nitrobenzyl bromide. 1977

T E Barman, and R A Perry

The reaction of human alpha-lactalbumin with the tryptophan reagent 2-hydroxy-5-nitrobenzyl bromide has been studied. This protein has 3 tryptophan residues (Trp-60, Trp-104 and Trp-118) all of which are accessible to the reagent at pH 2.7 or 7. Trp-60 of human alpha-lactalbumin is much more reactive than Trp-60 of bovine alpha-lactalbumin (Barman, T. E. (1972) Biochim. Biophys. Acta 257, 297-313). As with bovine alpha-lactalbumin, at pH 2.7, 2-hydroxy-5-nitrobenzyl bromide is specific for tryptophan but at pH 7 His-32 also reacts. When treated with the tryptophan reagent, both alpha-lactalbumins lose their specifier protein activities in the lactose synthase (UDPgalactose:D-glucose 4-beta-galactosyltransferase, EC 2.4.1.22) reaction.

UI MeSH Term Description Entries
D007768 Lactalbumin A major protein fraction of milk obtained from the WHEY. alpha-Lactalbumin,alpha-Lactalbumin A,alpha-Lactalbumin B,alpha-Lactalbumin C,alpha Lactalbumin,alpha Lactalbumin A,alpha Lactalbumin B,alpha Lactalbumin C
D007788 Lactose Synthase 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. Lactose Synthetase,N-Acetylgucosamide 1-4 beta Galactosyl Transferase,N Acetylgucosamide 1 4 beta Galactosyl Transferase,Synthase, Lactose,Synthetase, Lactose
D009596 Nitrophenols PHENOLS carrying nitro group substituents. Nitrophenol
D002417 Cattle Domesticated bovine animals of the genus Bos, usually kept on a farm or ranch and used for the production of meat or dairy products or for heavy labor. Beef Cow,Bos grunniens,Bos indicus,Bos indicus Cattle,Bos taurus,Cow,Cow, Domestic,Dairy Cow,Holstein Cow,Indicine Cattle,Taurine Cattle,Taurus Cattle,Yak,Zebu,Beef Cows,Bos indicus Cattles,Cattle, Bos indicus,Cattle, Indicine,Cattle, Taurine,Cattle, Taurus,Cattles, Bos indicus,Cattles, Indicine,Cattles, Taurine,Cattles, Taurus,Cow, Beef,Cow, Dairy,Cow, Holstein,Cows,Dairy Cows,Domestic Cow,Domestic Cows,Indicine Cattles,Taurine Cattles,Taurus Cattles,Yaks,Zebus
D002621 Chemistry A basic science concerned with the composition, structure, and properties of matter; and the reactions that occur between substances and the associated energy exchange.
D006639 Histidine An essential amino acid that is required for the production of HISTAMINE. Histidine, L-isomer,L-Histidine,Histidine, L isomer,L-isomer Histidine
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D013329 Structure-Activity Relationship The relationship between the chemical structure of a compound and its biological or pharmacological activity. Compounds are often classed together because they have structural characteristics in common including shape, size, stereochemical arrangement, and distribution of functional groups. Relationship, Structure-Activity,Relationships, Structure-Activity,Structure Activity Relationship,Structure-Activity Relationships
D014364 Tryptophan An essential amino acid that is necessary for normal growth in infants and for NITROGEN balance in adults. It is a precursor of INDOLE ALKALOIDS in plants. It is a precursor of SEROTONIN (hence its use as an antidepressant and sleep aid). It can be a precursor to NIACIN, albeit inefficiently, in mammals. Ardeydorm,Ardeytropin,L-Tryptophan,L-Tryptophan-ratiopharm,Levotryptophan,Lyphan,Naturruhe,Optimax,PMS-Tryptophan,Trofan,Tryptacin,Tryptan,Tryptophan Metabolism Alterations,ratio-Tryptophan,L Tryptophan,L Tryptophan ratiopharm,PMS Tryptophan,ratio Tryptophan

Related Publications

T E Barman, and R A Perry
Reactivities of the tryptophan residues of alpha-lactalbumin and lysozyme to 2-hydroxy-5-nitrobenzyl bromide.
September 1970, Journal of molecular biology,
T E Barman, and R A Perry
The modification of the tryptophan residues of bovine alpha-lactalbumin with 2-hydroxy-5-nitrobenzyl bromide and with dimethyl(2-hydroxy-5-nitrobenzyl)sulphonium bromide.
February 1972, Biochimica et biophysica acta,
T E Barman, and R A Perry
Modification of laccase tryptophan residues with 2-hydroxy-5-nitrobenzyl bromide.
July 1978, FEBS letters,
T E Barman, and R A Perry
The modification of the tryptophan residues of bovine -lactalbumin with 2-hydroxy-5-nitrobenzyl bromide and with dimethyl(2-hydroxy-5-nitrobenzyl)sulphonium bromide. II. Effect on the specifier protein activity.
October 1972, Biochimica et biophysica acta,
T E Barman, and R A Perry
[Modification of tryptophan residues in immunoglobulin M by 2-hydroxy-5-nitrobenzyl bromide].
February 1985, Biokhimiia (Moscow, Russia),
T E Barman, and R A Perry
The chemistry of the reaction of 2-hydroxy-5-nitrobenzyl bromide with his-32 of alpha-lactalbumin.
February 1978, European journal of biochemistry,
T E Barman, and R A Perry
Effect of tryptophan modification in cow and buffalo alpha-lactalbumin on galactosyltransferase activity--modification by 2-nitrophenyl sulphenyl chloride and 2-hydroxy 5-nitrobenzyl bromide.
February 1987, Indian journal of biochemistry & biophysics,
T E Barman, and R A Perry
The chemistry of the modification of tryptophan with 2-hydroxy-5-nitrobenzyl bromide.
May 1969, Journal of the American Chemical Society,
T E Barman, and R A Perry
Reactivity of tryptophyl residues in elastase with 2-hydroxy-5-nitrobenzyl bromide.
February 1975, FEBS letters,
T E Barman, and R A Perry
[Chemical modification of tryptophan residues of leucyl tRNA synthetase by N-bromosuccinimide and 2-hydroxy-5-nitrobenzyl bromide].
May 1985, Bioorganicheskaia khimiia,
Copied contents to your clipboard!