TY - JOUR
T1 - An iterative structure-assisted approach to sequence alignment and comparative modeling
AU - Burke, David F.
AU - Deane, Charlotte M.
AU - Nagarajaram, Hampapathalu A.
AU - Campillo, Nuria
AU - Martin-Martinez, Mercedes
AU - Mendes, Joaquim
AU - Molina, Franck
AU - Perry, Jeff
AU - Reddy, B. V.B.
AU - Soares, Claudio M.
AU - Steward, Robert E.
AU - Williams, Mark
AU - Carrondo, Maria Armenia
AU - Blundell, Tom L.
AU - Mizuguchi, Kenji
PY - 1999
Y1 - 1999
N2 - Correct alignment of the sequence of a target protein with those of homologues of known three-dimensional structure is a key step in comparative modeling. Usually an iterative approach that takes account of the local and overall structural features is required. We describe such an approach that exploits databases of structural alignments of homologous proteins (HOMSTRAD, http://www-cryst.bioc.cam.ac.uk/homstrad) and protein superfamilies (CAMPASS, http://www-cryst.bioc.cam.ac.uk/campass), in which structure-based alignments are analyzed and formatted with the program JOY (http://www- cryst.bioc.cam.ac.uk/joy) to reveal conserved local structural features. The databases facilitate the recognition of a family or superfamily, they assist in the selection of useful parent structures, they are helpful in alignment of the target sequences with the parent set, and are useful for deriving relationships that can be used in validating models. In the iterative approach, a model is constructed on the basis of the proposed sequence alignment and this is then reexpressed in the JOY format and realigned with the parent set. This is repeated until the model and sequence alignment is optimized. We examine the case for comparison and use of multiple structures of family members, rather than a single parent structure. We use the targets attempted by our group in CASP3 to assess the value of such procedures.
AB - Correct alignment of the sequence of a target protein with those of homologues of known three-dimensional structure is a key step in comparative modeling. Usually an iterative approach that takes account of the local and overall structural features is required. We describe such an approach that exploits databases of structural alignments of homologous proteins (HOMSTRAD, http://www-cryst.bioc.cam.ac.uk/homstrad) and protein superfamilies (CAMPASS, http://www-cryst.bioc.cam.ac.uk/campass), in which structure-based alignments are analyzed and formatted with the program JOY (http://www- cryst.bioc.cam.ac.uk/joy) to reveal conserved local structural features. The databases facilitate the recognition of a family or superfamily, they assist in the selection of useful parent structures, they are helpful in alignment of the target sequences with the parent set, and are useful for deriving relationships that can be used in validating models. In the iterative approach, a model is constructed on the basis of the proposed sequence alignment and this is then reexpressed in the JOY format and realigned with the parent set. This is repeated until the model and sequence alignment is optimized. We examine the case for comparison and use of multiple structures of family members, rather than a single parent structure. We use the targets attempted by our group in CASP3 to assess the value of such procedures.
KW - Alignment annotation
KW - Alignment databases
KW - Local structural features
KW - Loop modeling
KW - Model evaluation
KW - Protein family
KW - Protein structure
KW - Side-chain modeling
KW - Structure prediction
UR - http://www.scopus.com/inward/record.url?scp=0032613202&partnerID=8YFLogxK
U2 - 10.1002/(SICI)1097-0134(1999)37:3+<55::AID-PROT8>3.0.CO;2-B
DO - 10.1002/(SICI)1097-0134(1999)37:3+<55::AID-PROT8>3.0.CO;2-B
M3 - Article
C2 - 10526352
AN - SCOPUS:0032613202
SN - 0887-3585
VL - 37
SP - 55
EP - 60
JO - Proteins: Structure, Function and Genetics
JF - Proteins: Structure, Function and Genetics
IS - SUPPL. 3
ER -