A comparison was made of the distribution of @entity1472 terminal end groups in the cellular proteins of a number of microbes. Among the procaryotes, @entity1853 is a highly variable but virtually ubiquitous major protein end group. This is consistent with its possible role as a general @entity535 initiator of protein biosynthesis in the procaryotes. Generally, however, @entity493 is the most abundant of the major end groups, followed in decreasing order by @entity563 , @entity1889 , the acidic @entity1522 , and occasionally @entity376 . No other new major end-groups were found. Among 15 representatives of the Enterobacteriaceae, retention of the initiating @entity1853 terminus of the cellular protein varies considerably at a tribal level and is randomized at a familial level. The profiles of the five remaining end groups, however, are strikingly uniform, and are, for example, close to but significantly different from those of the Erwineae. Among the taxonomically more heterogeneous Bacillaceae, end-group profiles vary more and are sometimes unrelated. End-group analysis is thus particularly useful as a molecular criterion of taxonomy in assessing familial homogeneity. Free @entity2733 termini in eucaryote cell proteins are fewer, and they have increased acidic @entity535 components and no @entity1853 ; they are otherwise similar to those of the procaryotes.

Taxonomic comparison of the XXXX termini of microbial cell proteins.

@entity1522 :: ('CHEBI:33709', 'Chemical') :: ['amino acids'] @entity1472 :: ('CHEBI:46882', 'Chemical') :: ['amino'] @entity535 :: ('CHEBI:33704', 'Chemical') :: ['amino acid'] @entity1853 :: ('MESH:D008715', 'Chemical') :: ['methionine'] @entity2733 :: ('CHEBI:29345', 'Chemical') :: ['NH(2)'] @entity376 :: ('CHEBI:25094', 'Chemical') :: ['lysine'] @entity563 :: ('CHEBI:17822', 'Chemical') :: ['serine'] @entity1889 :: ('CHEBI:26986', 'Chemical') :: ['threonine'] @entity493 :: ('CHEBI:16449', 'Chemical') :: ['alanine']
@entity1472 :: (CHEBI:46882,Chemical) :: ['amino']
