Linked Life Data

3922402

Source:http://linkedlifedata.com/resource/pubmed/id/3922402

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1985-7-2
pubmed:abstractText
The conversion of type I procollagen to type I collagen was studied by cleaving the protein with partically purified type I procollagen N-proteinase from chick embryos. Examination of the reaction products after incubation for varying times at 30 degrees C indicated that, during the initial stages of the reaction, pro alpha 1(I) and pro alpha 2(I) chains were cleaved at about the same rate. As a result, all the pro alpha 2(I) chains were converted to pC alpha 2(I) chains well before all the pro alpha 1 chains were cleaved. When the reaction products were examined by gel electrophoresis without reduction of interchain disulfide bonds, a distinct band of an intermediate was detected. The same intermediate was seen when the reaction was carried out at 35, 37, and 40 degrees C. The data established that over two-thirds of the type I procollagen was converted to the intermediate and that this intermediate was then slowly converted to the final product of pCcollagen. The kinetics for the reaction, however, did not fit a simple model for precursor-product relationship among substrate, intermediate, and product. Examination of the reaction products with a two-step gel procedure demonstrated that the intermediate consisted of three polypeptide chains in which the N propeptide was cleaved from one pro alpha 1 chain and one pro alpha 2(I) chain but the N propeptide was still present on one of the pro alpha 1(I) chains. In further experiments it was demonstrated that a similar intermediate was seen when a homotrimer of pro alpha 1(I) chains was partially cleaved by the enzyme.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0006-2960
pubmed:author
pubmed:issnType
Print
pubmed:day
29
pubmed:volume
24
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
600-5
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1985
pubmed:articleTitle
Sequential cleavage of type I procollagen by procollagen N-proteinase. An intermediate containing an uncleaved pro alpha 1(I) chain.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't