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C5233

Sigma-Aldrich

Carboxypeptidase B from human pancreas

50-55 units/mg protein carboxypeptidase B

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Synonym(s):
Peptidyl-L-Lysine[L-arginine] hydrolase
CAS Number:
Enzyme Commission number:
MDL number:
PubChem Substance ID:
NACRES:
NA.54

biological source

human pancreas

Quality Level

form

solution

specific activity

50-55 units/mg protein carboxypeptidase B

impurities

≤0.2% chymotrypsin
≤0.2% trypsin
≤1 unit/mg protein carboxypeptidase A

UniProt accession no.

shipped in

dry ice

storage temp.

−20°C

InChI

1S/C31H38N4O7S/c1-20(32-26(36)15-16-27(37)38)28(39)33-21(2)30(41)35-17-9-14-25(35)29(40)34-24(18-22-10-5-3-6-11-22)31(42)43-19-23-12-7-4-8-13-23/h3-8,10-13,20-21,24-25H,9,14-19H2,1-2H3,(H,32,36)(H,33,39)(H,34,40)(H,37,38)

InChI key

TWURVFFNODFJBJ-UHFFFAOYSA-N

Gene Information

human ... CPB1(1360)

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This Item
C9584C8946C0150
vibrant-m

C8946

α-Chymotrypsin from human pancreas

vibrant-m

C0150

Cathepsin B from human placenta

biological source

human pancreas

biological source

Porcine pancreas

biological source

human pancreas

biological source

-

Gene Information

human ... CPB1(1360)

Gene Information

-

Gene Information

human ... CTRB1(1504)

Gene Information

human ... CTSB(1508)

UniProt accession no.

P15086

UniProt accession no.

-

UniProt accession no.

P17538

UniProt accession no.

P07858

shipped in

dry ice

shipped in

-

shipped in

-

shipped in

-

form

solution

form

lyophilized powder

form

lyophilized powder

form

lyophilized powder

General description

Carboxypeptidase B is mapped to human chromosome 3q24. Carboxypeptidase B belongs to A/B subfamily of carboxypeptidases.

Application

Carboxypeptidase B from Sigma has been used as a reference for assaying carboxypeptidase activity in lysed pituitary granules derived from the anterior and intermediate lobes of rat. The enzyme has also been used to digest plasma samples by removing C-terminal basic amino acids, to get a distinct band for each allotype during C4 electrophoresis.

Biochem/physiol Actions

Carboxypeptidase B (or peptidyl-L-lysine (-L-arginine) hydrolase) catalyzes the hydrolysis of the basic amino acids, lysine, arginine, and ornithine from the C-terminal position of polypeptides. It has been shown to be a single polypeptide of 34,000 Da. Trypsin is capable of converting native enzyme to the active enzyme, carboxypeptidase B II in vitro. The optimum pH is found to be 9.0. The enzyme may be used for sequence analysis by successive cleavage of C-terminal basic amino acids. It can also be used as a serum marker for the diagnosis of acute pancreatitis.
Mutations in the carboxypeptidase B (CPB1) gene is implicated with increased susceptibility to pancreatic cancer development and progression. Elevated levels of CPB1 is associated with low grade breast tumors and lymph node positive grade 1 tumors.

Unit Definition

One unit will hydrolyze 1 μmole of hippuryl-L-arginine per minute at pH 7.7 at 25 °C

Physical form

Solution in 0.05 M NaOAc pH 5.0 + 1.0 M NaCl + 0.01% NaN3

Storage Class

12 - Non Combustible Liquids

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable


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